23646329 divided by 621 
The aim is to understand the frequency of 621 in 23646329.

On to step 1:
2 divided by 621 is 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 621

Let's proceed to step 2:
The number 621 fits into 23 0 times, leaving a remainder of 23.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 23 after subtracting 0 from 23.
Include the next digit (6) from the dividend after 23, then repeat: 236 / 621

Going ahead to step 3:
236 divided by 621 is 0 with a remainder of 236.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 236 leaves us with 236.
Include the next digit (4) from the dividend after 236, then repeat: 2364 / 621

Going ahead to step 4:
621 can be fit into 2364 3 times, resulting in a remainder of 501.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Deduct 1863 from 2364 and we're left with 501.
Fetch the next digit (6) from the dividend, attach it to 501 and continue: 5016 / 621

Moving on to step 5:
621 goes into 5016 8 times with a remainder of 48.
Record the quotient 8 as the next digit in the result. 
Result so far: 38.0
If we take 4968 away from 5016, we end up with 48.
Grab the next digit (3) from the dividend, add it to 48, then carry on: 483 / 621

Step 6:
The number 621 fits into 483 0 times, leaving a remainder of 483.
Use 0 as the next digit of our solution. 
Result so far: 380.0
Subtracting 0 from 483 leaves us with 483.
Take the next digit (2) from the dividend and append it to 483, then repeat: 4832 / 621

Let's proceed to step 7:
621 goes into 4832 7 times with a remainder of 485.
Write down 7 as next digit of the result. 
Result so far: 3807.0
Subtract 4347 from 4832 to get 485.
Fetch the next digit (9) from the dividend, attach it to 485 and continue: 4859 / 621

Let's proceed to step 8:
When dividing 4859 by 621, we get 7 with a remainder of 512.
Use 7 as the next digit of our solution. 
Result so far: 38077.0
Deduct 4347 from 4859 and we're left with 512.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5120, and continue the process.

Moving on to step 9:
5120 divided by 621 is 8 with a remainder of 152.
The next digit of our result is 8. 
Result so far: 38077.8
Deduct 4968 from 5120 and we're left with 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

Going ahead to step 10:
If we divide 1520 by 621, we get 2 and a remainder of 278.
Put 2 as the next digit of the answer. 
Result so far: 38077.82
Subtracting 1242 from 1520 leaves us with 278.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2780, and continue the process.

Let's proceed to step 11:
If we divide 2780 by 621, we get 4 and a remainder of 296.
Put 4 as the next digit of the answer. 
Result so far: 38077.824
If we subtract 2484 from 2780, we get 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

Step 12:
621 can be fit into 2960 4 times, resulting in a remainder of 476.
The number 4 becomes the next digit in our result. 
Result so far: 38077.8244
Subtract 2484 from 2960 to get 476.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4760, and continue the process.

The final result is 38077.8244 with a remainder of 0.00476.