728309 divided by 23 
The aim is to understand the frequency of 23 in 728309.

Moving on to step 1:
7 divided by 23 is 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 23

Moving on to step 2:
The number 23 fits into 72 3 times, leaving a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 69 from 72 and we're left with 3.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 23

Let's proceed to step 3:
23 goes into 38 1 times with a remainder of 15.
The next digit of our result is 1. 
Result so far: 31.0
The remainder is 15 after subtracting 23 from 38.
Grab the next digit (3) from the dividend, add it to 15, then carry on: 153 / 23

On to step 4:
If we divide 153 by 23, we get 6 and a remainder of 15.
Record the quotient 6 as the next digit in the result. 
Result so far: 316.0
If we subtract 138 from 153, we get 15.
Take the next digit (0) from the dividend and append it to 15, then repeat: 150 / 23

On to step 5:
When dividing 150 by 23, we get 6 with a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 3166.0
If we take 138 away from 150, we end up with 12.
Fetch the next digit (9) from the dividend, attach it to 12 and continue: 129 / 23

Advancing to step 6:
When dividing 129 by 23, we get 5 with a remainder of 14.
Write down 5 as next digit of the result. 
Result so far: 31665.0
If we subtract 115 from 129, 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.

Moving on to step 7:
23 goes into 140 6 times with a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 31665.6
Subtract 138 from 140 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 8:
The number 23 fits into 20 0 times, leaving a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 31665.6
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 9:
When dividing 200 by 23, we get 8 with a remainder of 16.
The next digit of our result is 8. 
Result so far: 31665.608
The remainder is 16 after subtracting 184 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 10:
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: 31665.6086
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.

Advancing to step 11:
When dividing 220 by 23, we get 9 with a remainder of 13.
The next digit of our result is 9. 
Result so far: 31665.60869
The remainder is 13 after subtracting 207 from 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 12:
If we divide 130 by 23, we get 5 and a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 31665.608695
The remainder is 15 after subtracting 115 from 130.
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 13:
23 can be fit into 150 6 times, resulting in a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 31665.6086956
If we take 138 away from 150, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 14:
If we divide 120 by 23, we get 5 and a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 31665.60869565
If we take 115 away from 120, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Our division results in 31665.60869565 with a remaining 5e-09.