Let's divide 28659684 by 521
The aim is to understand the frequency of 521 in 28659684.

Advancing to step 1:
2 divided by 521 is 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 521

Moving on to step 2:
When dividing 28 by 521, we get 0 with a remainder of 28.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 28 after subtracting 0 from 28.
Fetch the next digit (6) from the dividend, attach it to 28 and continue: 286 / 521

Step 3:
286 divided by 521 is 0 with a remainder of 286.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 286, we end up with 286.
Append the next digit (5) from the dividend to 286 and continue with: 2865 / 521

Step 4:
2865 divided by 521 is 5 with a remainder of 260.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we take 2605 away from 2865, we end up with 260.
Bring next digit (9) of the dividend behind the 260 and repeat the process: 2609 / 521

Let's proceed to step 5:
If we divide 2609 by 521, we get 5 and a remainder of 4.
Put 5 as the next digit of the answer. 
Result so far: 55.0
The remainder is 4 after subtracting 2605 from 2609.
Include the next digit (6) from the dividend after 4, then repeat: 46 / 521

Step 6:
If we divide 46 by 521, we get 0 and a remainder of 46.
Use 0 as the next digit of our solution. 
Result so far: 550.0
Subtract 0 from 46 to get 46.
Fetch the next digit (8) from the dividend, attach it to 46 and continue: 468 / 521

Going ahead to step 7:
If we divide 468 by 521, we get 0 and a remainder of 468.
Use 0 as the next digit of our solution. 
Result so far: 5500.0
The remainder is 468 after subtracting 0 from 468.
Append the next digit (4) from the dividend to 468 and continue with: 4684 / 521

Going ahead to step 8:
521 can be fit into 4684 8 times, resulting in a remainder of 516.
The next digit of our result is 8. 
Result so far: 55008.0
The remainder is 516 after subtracting 4168 from 4684.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5160, and continue the process.

Let's proceed to step 9:
521 goes into 5160 9 times with a remainder of 471.
The next digit of our result is 9. 
Result so far: 55008.9
Subtract 4689 from 5160 to get 471.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4710, and continue the process.

On to step 10:
521 can be fit into 4710 9 times, resulting in a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 55008.99
Subtract 4689 from 4710 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

The quotient of the division is 55008.99, and the remainder is 0.021.