86721276 divided by 621 
The aim is to understand the frequency of 621 in 86721276.

Moving on to step 1:
If we divide 8 by 621, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 621

Let's proceed to step 2:
621 can be fit into 86 0 times, resulting in a remainder of 86.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 86, we get 86.
Grab the next digit (7) from the dividend, add it to 86, then carry on: 867 / 621

Moving on to step 3:
If we divide 867 by 621, we get 1 and a remainder of 246.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 621 from 867 to get 246.
Grab the next digit (2) from the dividend, add it to 246, then carry on: 2462 / 621

On to step 4:
The number 621 fits into 2462 3 times, leaving a remainder of 599.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
If we take 1863 away from 2462, we end up with 599.
Bring next digit (1) of the dividend behind the 599 and repeat the process: 5991 / 621

Let's proceed to step 5:
If we divide 5991 by 621, we get 9 and a remainder of 402.
Write down 9 as next digit of the result. 
Result so far: 139.0
Subtract 5589 from 5991 to get 402.
Bring next digit (2) of the dividend behind the 402 and repeat the process: 4022 / 621

Going ahead to step 6:
621 goes into 4022 6 times with a remainder of 296.
Write down 6 as next digit of the result. 
Result so far: 1396.0
The remainder is 296 after subtracting 3726 from 4022.
Fetch the next digit (7) from the dividend, attach it to 296 and continue: 2967 / 621

Going ahead to step 7:
2967 divided by 621 is 4 with a remainder of 483.
Put 4 as the next digit of the answer. 
Result so far: 13964.0
Subtract 2484 from 2967 to get 483.
Grab the next digit (6) from the dividend, add it to 483, then carry on: 4836 / 621

On to step 8:
4836 divided by 621 is 7 with a remainder of 489.
Record the quotient 7 as the next digit in the result. 
Result so far: 139647.0
The remainder is 489 after subtracting 4347 from 4836.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4890, and continue the process.

On to step 9:
4890 divided by 621 is 7 with a remainder of 543.
Put 7 as the next digit of the answer. 
Result so far: 139647.7
Subtracting 4347 from 4890 leaves us with 543.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5430, and continue the process.

Moving on to step 10:
621 can be fit into 5430 8 times, resulting in a remainder of 462.
The number 8 becomes the next digit in our result. 
Result so far: 139647.78
If we subtract 4968 from 5430, we get 462.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4620, and continue the process.

Going ahead to step 11:
621 can be fit into 4620 7 times, resulting in a remainder of 273.
The number 7 becomes the next digit in our result. 
Result so far: 139647.787
Subtracting 4347 from 4620 leaves us with 273.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2730, and continue the process.

Advancing to step 12:
When dividing 2730 by 621, we get 4 with a remainder of 246.
Record the quotient 4 as the next digit in the result. 
Result so far: 139647.7874
If we subtract 2484 from 2730, we get 246.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2460, and continue the process.

Moving on to step 13:
If we divide 2460 by 621, we get 3 and a remainder of 597.
Record the quotient 3 as the next digit in the result. 
Result so far: 139647.78743
Subtract 1863 from 2460 to get 597.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5970, and continue the process.

On to step 14:
5970 divided by 621 is 9 with a remainder of 381.
The next digit of our result is 9. 
Result so far: 139647.787439
If we subtract 5589 from 5970, we get 381.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3810, and continue the process.

Moving on to step 15:
When dividing 3810 by 621, we get 6 with a remainder of 84.
Use 6 as the next digit of our solution. 
Result so far: 139647.7874396
The remainder is 84 after subtracting 3726 from 3810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Advancing to step 16:
621 can be fit into 840 1 times, resulting in a remainder of 219.
Put 1 as the next digit of the answer. 
Result so far: 139647.78743961
Subtracting 621 from 840 leaves us with 219.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2190, and continue the process.

In conclusion, the division gives 139647.78743961 with a balance of 2.19e-07.