We're dividing 52077819 by 621 
The aim is to understand the frequency of 621 in 52077819.

Let's proceed to step 1:
If we divide 5 by 621, we get 0 and a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Include the next digit (2) from the dividend after 5, then repeat: 52 / 621

Moving on to step 2:
The number 621 fits into 52 0 times, leaving a remainder of 52.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 52, we get 52.
Append the next digit (0) from the dividend to 52 and continue with: 520 / 621

Advancing to step 3:
If we divide 520 by 621, we get 0 and a remainder of 520.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 520, we end up with 520.
Append the next digit (7) from the dividend to 520 and continue with: 5207 / 621

Moving on to step 4:
621 can be fit into 5207 8 times, resulting in a remainder of 239.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 4968 away from 5207, we end up with 239.
Take the next digit (7) from the dividend and append it to 239, then repeat: 2397 / 621

Advancing to step 5:
621 can be fit into 2397 3 times, resulting in a remainder of 534.
The number 3 becomes the next digit in our result. 
Result so far: 83.0
If we subtract 1863 from 2397, we get 534.
Take the next digit (8) from the dividend and append it to 534, then repeat: 5348 / 621

Let's proceed to step 6:
If we divide 5348 by 621, we get 8 and a remainder of 380.
The number 8 becomes the next digit in our result. 
Result so far: 838.0
Deduct 4968 from 5348 and we're left with 380.
Grab the next digit (1) from the dividend, add it to 380, then carry on: 3801 / 621

On to step 7:
If we divide 3801 by 621, we get 6 and a remainder of 75.
The number 6 becomes the next digit in our result. 
Result so far: 8386.0
Subtract 3726 from 3801 to get 75.
Take the next digit (9) from the dividend and append it to 75, then repeat: 759 / 621

Moving on to step 8:
621 goes into 759 1 times with a remainder of 138.
Write down 1 as next digit of the result. 
Result so far: 83861.0
If we take 621 away from 759, we end up with 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

Moving on to step 9:
1380 divided by 621 is 2 with a remainder of 138.
Put 2 as the next digit of the answer. 
Result so far: 83861.2
The remainder is 138 after subtracting 1242 from 1380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

On to step 10:
1380 divided by 621 is 2 with a remainder of 138.
The number 2 becomes the next digit in our result. 
Result so far: 83861.22
If we subtract 1242 from 1380, we get 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

The final result is 83861.22 with a remainder of 0.138.