We look at the division of 87258596 by 604 
The aim is to understand the frequency of 604 in 87258596.

Going ahead to step 1:
The number 604 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 604

Advancing to step 2:
604 can be fit into 87 0 times, resulting in a remainder of 87.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 87 to get 87.
Append the next digit (2) from the dividend to 87 and continue with: 872 / 604

Going ahead to step 3:
604 goes into 872 1 times with a remainder of 268.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 604 from 872, we get 268.
Bring next digit (5) of the dividend behind the 268 and repeat the process: 2685 / 604

Let's proceed to step 4:
When dividing 2685 by 604, we get 4 with a remainder of 269.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
Subtracting 2416 from 2685 leaves us with 269.
Bring next digit (8) of the dividend behind the 269 and repeat the process: 2698 / 604

Going ahead to step 5:
The number 604 fits into 2698 4 times, leaving a remainder of 282.
The number 4 becomes the next digit in our result. 
Result so far: 144.0
If we subtract 2416 from 2698, we get 282.
Bring next digit (5) of the dividend behind the 282 and repeat the process: 2825 / 604

On to step 6:
When dividing 2825 by 604, we get 4 with a remainder of 409.
Write down 4 as next digit of the result. 
Result so far: 1444.0
Deduct 2416 from 2825 and we're left with 409.
Bring next digit (9) of the dividend behind the 409 and repeat the process: 4099 / 604

Advancing to step 7:
If we divide 4099 by 604, we get 6 and a remainder of 475.
Put 6 as the next digit of the answer. 
Result so far: 14446.0
The remainder is 475 after subtracting 3624 from 4099.
Include the next digit (6) from the dividend after 475, then repeat: 4756 / 604

Advancing to step 8:
When dividing 4756 by 604, we get 7 with a remainder of 528.
Write down 7 as next digit of the result. 
Result so far: 144467.0
Subtracting 4228 from 4756 leaves us with 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Advancing to step 9:
604 can be fit into 5280 8 times, resulting in a remainder of 448.
Write down 8 as next digit of the result. 
Result so far: 144467.8
Subtracting 4832 from 5280 leaves us with 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

On to step 10:
When dividing 4480 by 604, we get 7 with a remainder of 252.
Write down 7 as next digit of the result. 
Result so far: 144467.87
If we take 4228 away from 4480, we end up with 252.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2520, and continue the process.

Let's proceed to step 11:
604 can be fit into 2520 4 times, resulting in a remainder of 104.
The next digit of our result is 4. 
Result so far: 144467.874
Subtracting 2416 from 2520 leaves us with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

On to step 12:
604 goes into 1040 1 times with a remainder of 436.
Write down 1 as next digit of the result. 
Result so far: 144467.8741
If we take 604 away from 1040, we end up with 436.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

Let's proceed to step 13:
4360 divided by 604 is 7 with a remainder of 132.
Put 7 as the next digit of the answer. 
Result so far: 144467.87417
The remainder is 132 after subtracting 4228 from 4360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

On to step 14:
604 can be fit into 1320 2 times, resulting in a remainder of 112.
Put 2 as the next digit of the answer. 
Result so far: 144467.874172
Subtract 1208 from 1320 to get 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Advancing to step 15:
The number 604 fits into 1120 1 times, leaving a remainder of 516.
Record the quotient 1 as the next digit in the result. 
Result so far: 144467.8741721
Subtracting 604 from 1120 leaves us with 516.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5160, and continue the process.

On to step 16:
The number 604 fits into 5160 8 times, leaving a remainder of 328.
The next digit of our result is 8. 
Result so far: 144467.87417218
If we subtract 4832 from 5160, we get 328.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

The final outcome is 144467.87417218, with a leftover of 3.28e-07.