We look at the division of 25664091 by 607 
The aim is to understand the frequency of 607 in 25664091.

Going ahead to step 1:
If we divide 2 by 607, we get 0 and a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 607

Step 2:
The number 607 fits into 25 0 times, leaving a remainder of 25.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 25 and we're left with 25.
Take the next digit (6) from the dividend and append it to 25, then repeat: 256 / 607

Going ahead to step 3:
The number 607 fits into 256 0 times, leaving a remainder of 256.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 256 leaves us with 256.
Grab the next digit (6) from the dividend, add it to 256, then carry on: 2566 / 607

Advancing to step 4:
607 can be fit into 2566 4 times, resulting in a remainder of 138.
Use 4 as the next digit of our solution. 
Result so far: 4.0
The remainder is 138 after subtracting 2428 from 2566.
Fetch the next digit (4) from the dividend, attach it to 138 and continue: 1384 / 607

Moving on to step 5:
607 can be fit into 1384 2 times, resulting in a remainder of 170.
Write down 2 as next digit of the result. 
Result so far: 42.0
The remainder is 170 after subtracting 1214 from 1384.
Append the next digit (0) from the dividend to 170 and continue with: 1700 / 607

Let's proceed to step 6:
607 can be fit into 1700 2 times, resulting in a remainder of 486.
Record the quotient 2 as the next digit in the result. 
Result so far: 422.0
The remainder is 486 after subtracting 1214 from 1700.
Include the next digit (9) from the dividend after 486, then repeat: 4869 / 607

Going ahead to step 7:
If we divide 4869 by 607, we get 8 and a remainder of 13.
The number 8 becomes the next digit in our result. 
Result so far: 4228.0
The remainder is 13 after subtracting 4856 from 4869.
Include the next digit (1) from the dividend after 13, then repeat: 131 / 607

Step 8:
607 goes into 131 0 times with a remainder of 131.
Write down 0 as next digit of the result. 
Result so far: 42280.0
The remainder is 131 after subtracting 0 from 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

Advancing to step 9:
607 can be fit into 1310 2 times, resulting in a remainder of 96.
Record the quotient 2 as the next digit in the result. 
Result so far: 42280.2
If we take 1214 away from 1310, we end up with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Step 10:
The number 607 fits into 960 1 times, leaving a remainder of 353.
Use 1 as the next digit of our solution. 
Result so far: 42280.21
If we subtract 607 from 960, we get 353.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3530, and continue the process.

On to step 11:
The number 607 fits into 3530 5 times, leaving a remainder of 495.
The number 5 becomes the next digit in our result. 
Result so far: 42280.215
Subtracting 3035 from 3530 leaves us with 495.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4950, and continue the process.

Step 12:
607 can be fit into 4950 8 times, resulting in a remainder of 94.
The next digit of our result is 8. 
Result so far: 42280.2158
The remainder is 94 after subtracting 4856 from 4950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Advancing to step 13:
940 divided by 607 is 1 with a remainder of 333.
The next digit of our result is 1. 
Result so far: 42280.21581
If we take 607 away from 940, we end up with 333.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3330, and continue the process.

Advancing to step 14:
If we divide 3330 by 607, we get 5 and a remainder of 295.
Record the quotient 5 as the next digit in the result. 
Result so far: 42280.215815
Deduct 3035 from 3330 and we're left with 295.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2950, and continue the process.

On to step 15:
The number 607 fits into 2950 4 times, leaving a remainder of 522.
Use 4 as the next digit of our solution. 
Result so far: 42280.2158154
If we subtract 2428 from 2950, we get 522.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5220, and continue the process.

Advancing to step 16:
607 can be fit into 5220 8 times, resulting in a remainder of 364.
The number 8 becomes the next digit in our result. 
Result so far: 42280.21581548
Subtracting 4856 from 5220 leaves us with 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

The final outcome is 42280.21581548, with a leftover of 3.64e-07.