We look at the division of 28809127 by 661 
The aim is to understand the frequency of 661 in 28809127.

On to step 1:
661 can be fit into 2 0 times, resulting in a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 661

On to step 2:
When dividing 28 by 661, we get 0 with a remainder of 28.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 28, we get 28.
Bring next digit (8) of the dividend behind the 28 and repeat the process: 288 / 661

Moving on to step 3:
The number 661 fits into 288 0 times, leaving a remainder of 288.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 288, we end up with 288.
Fetch the next digit (0) from the dividend, attach it to 288 and continue: 2880 / 661

Moving on to step 4:
2880 divided by 661 is 4 with a remainder of 236.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 2644 away from 2880, we end up with 236.
Append the next digit (9) from the dividend to 236 and continue with: 2369 / 661

On to step 5:
661 goes into 2369 3 times with a remainder of 386.
Use 3 as the next digit of our solution. 
Result so far: 43.0
If we subtract 1983 from 2369, we get 386.
Grab the next digit (1) from the dividend, add it to 386, then carry on: 3861 / 661

Going ahead to step 6:
3861 divided by 661 is 5 with a remainder of 556.
Use 5 as the next digit of our solution. 
Result so far: 435.0
If we take 3305 away from 3861, we end up with 556.
Bring next digit (2) of the dividend behind the 556 and repeat the process: 5562 / 661

Advancing to step 7:
If we divide 5562 by 661, we get 8 and a remainder of 274.
Use 8 as the next digit of our solution. 
Result so far: 4358.0
The remainder is 274 after subtracting 5288 from 5562.
Append the next digit (7) from the dividend to 274 and continue with: 2747 / 661

On to step 8:
When dividing 2747 by 661, we get 4 with a remainder of 103.
Write down 4 as next digit of the result. 
Result so far: 43584.0
Subtracting 2644 from 2747 leaves us with 103.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1030, and continue the process.

Step 9:
1030 divided by 661 is 1 with a remainder of 369.
Put 1 as the next digit of the answer. 
Result so far: 43584.1
If we take 661 away from 1030, we end up with 369.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3690, and continue the process.

Step 10:
When dividing 3690 by 661, we get 5 with a remainder of 385.
Write down 5 as next digit of the result. 
Result so far: 43584.15
If we take 3305 away from 3690, we end up with 385.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3850, and continue the process.

Let's proceed to step 11:
When dividing 3850 by 661, we get 5 with a remainder of 545.
Put 5 as the next digit of the answer. 
Result so far: 43584.155
Subtracting 3305 from 3850 leaves us with 545.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5450, and continue the process.

The quotient of the division is 43584.155, and the remainder is 0.0545.