We're dividing 86321737 by 621 
The aim is to understand the frequency of 621 in 86321737.

On to step 1:
The number 621 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Include the next digit (6) from the dividend after 8, then repeat: 86 / 621

Advancing to step 2:
621 goes into 86 0 times with a remainder of 86.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 86 leaves us with 86.
Append the next digit (3) from the dividend to 86 and continue with: 863 / 621

Advancing to step 3:
621 goes into 863 1 times with a remainder of 242.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 621 from 863, we get 242.
Include the next digit (2) from the dividend after 242, then repeat: 2422 / 621

Step 4:
2422 divided by 621 is 3 with a remainder of 559.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
Subtract 1863 from 2422 to get 559.
Fetch the next digit (1) from the dividend, attach it to 559 and continue: 5591 / 621

Step 5:
5591 divided by 621 is 9 with a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 139.0
Deduct 5589 from 5591 and we're left with 2.
Take the next digit (7) from the dividend and append it to 2, then repeat: 27 / 621

Step 6:
If we divide 27 by 621, we get 0 and a remainder of 27.
Use 0 as the next digit of our solution. 
Result so far: 1390.0
Subtract 0 from 27 to get 27.
Bring next digit (3) of the dividend behind the 27 and repeat the process: 273 / 621

Step 7:
273 divided by 621 is 0 with a remainder of 273.
The number 0 becomes the next digit in our result. 
Result so far: 13900.0
If we subtract 0 from 273, we get 273.
Grab the next digit (7) from the dividend, add it to 273, then carry on: 2737 / 621

Let's proceed to step 8:
When dividing 2737 by 621, we get 4 with a remainder of 253.
Put 4 as the next digit of the answer. 
Result so far: 139004.0
If we take 2484 away from 2737, we end up with 253.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2530, and continue the process.

Step 9:
The number 621 fits into 2530 4 times, leaving a remainder of 46.
Use 4 as the next digit of our solution. 
Result so far: 139004.4
Subtracting 2484 from 2530 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Moving on to step 10:
460 divided by 621 is 0 with a remainder of 460.
The number 0 becomes the next digit in our result. 
Result so far: 139004.4
Subtract 0 from 460 to get 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Going ahead to step 11:
The number 621 fits into 4600 7 times, leaving a remainder of 253.
The number 7 becomes the next digit in our result. 
Result so far: 139004.407
If we subtract 4347 from 4600, we get 253.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2530, and continue the process.

Advancing to step 12:
2530 divided by 621 is 4 with a remainder of 46.
Write down 4 as next digit of the result. 
Result so far: 139004.4074
If we subtract 2484 from 2530, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

On to step 13:
When dividing 460 by 621, we get 0 with a remainder of 460.
The next digit of our result is 0. 
Result so far: 139004.4074
Subtracting 0 from 460 leaves us with 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Let's proceed to step 14:
4600 divided by 621 is 7 with a remainder of 253.
The next digit of our result is 7. 
Result so far: 139004.407407
Subtract 4347 from 4600 to get 253.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2530, and continue the process.

Let's proceed to step 15:
2530 divided by 621 is 4 with a remainder of 46.
The number 4 becomes the next digit in our result. 
Result so far: 139004.4074074
If we subtract 2484 from 2530, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 16:
The number 621 fits into 460 0 times, leaving a remainder of 460.
Use 0 as the next digit of our solution. 
Result so far: 139004.4074074
If we take 0 away from 460, we end up with 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

In conclusion, the division gives 139004.4074074 with a balance of 4.6e-07.