We're dividing 664591 by 23 
The aim is to understand the frequency of 23 in 664591.

Advancing to step 1:
If we divide 6 by 23, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 23

Going ahead to step 2:
66 divided by 23 is 2 with a remainder of 20.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 46 away from 66, we end up with 20.
Bring next digit (4) of the dividend behind the 20 and repeat the process: 204 / 23

Advancing to step 3:
23 goes into 204 8 times with a remainder of 20.
The next digit of our result is 8. 
Result so far: 28.0
Deduct 184 from 204 and we're left with 20.
Include the next digit (5) from the dividend after 20, then repeat: 205 / 23

Let's proceed to step 4:
23 can be fit into 205 8 times, resulting in a remainder of 21.
Write down 8 as next digit of the result. 
Result so far: 288.0
If we take 184 away from 205, we end up with 21.
Fetch the next digit (9) from the dividend, attach it to 21 and continue: 219 / 23

Going ahead to step 5:
When dividing 219 by 23, we get 9 with a remainder of 12.
Put 9 as the next digit of the answer. 
Result so far: 2889.0
If we take 207 away from 219, we end up with 12.
Grab the next digit (1) from the dividend, add it to 12, then carry on: 121 / 23

Going ahead to step 6:
When dividing 121 by 23, we get 5 with a remainder of 6.
Write down 5 as next digit of the result. 
Result so far: 28895.0
The remainder is 6 after subtracting 115 from 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 7:
The number 23 fits into 60 2 times, leaving a remainder of 14.
The next digit of our result is 2. 
Result so far: 28895.2
If we subtract 46 from 60, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 8:
23 can be fit into 140 6 times, resulting in a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 28895.26
If we take 138 away from 140, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 9:
When dividing 20 by 23, we get 0 with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 28895.26
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 10:
When dividing 200 by 23, we get 8 with a remainder of 16.
The number 8 becomes the next digit in our result. 
Result so far: 28895.2608
Subtracting 184 from 200 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 11:
If we divide 160 by 23, we get 6 and a remainder of 22.
Use 6 as the next digit of our solution. 
Result so far: 28895.26086
If we take 138 away from 160, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Let's proceed to step 12:
When dividing 220 by 23, we get 9 with a remainder of 13.
The next digit of our result is 9. 
Result so far: 28895.260869
Deduct 207 from 220 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 13:
130 divided by 23 is 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 28895.2608695
Subtract 115 from 130 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 14:
The number 23 fits into 150 6 times, leaving a remainder of 12.
Write down 6 as next digit of the result. 
Result so far: 28895.26086956
The remainder is 12 after subtracting 138 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final outcome is 28895.26086956, with a leftover of 1.2e-08.