We look at the division of 28867687 by 866 
The aim is to understand the frequency of 866 in 28867687.

Let's proceed to step 1:
2 divided by 866 is 0 with a remainder of 2.
The number 0 becomes the next digit in our 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 / 866

On to step 2:
If we divide 28 by 866, we get 0 and a remainder of 28.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 28 leaves us with 28.
Grab the next digit (8) from the dividend, add it to 28, then carry on: 288 / 866

On to step 3:
If we divide 288 by 866, we get 0 and a remainder of 288.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 288, we end up with 288.
Include the next digit (6) from the dividend after 288, then repeat: 2886 / 866

On to step 4:
866 can be fit into 2886 3 times, resulting in a remainder of 288.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we subtract 2598 from 2886, we get 288.
Append the next digit (7) from the dividend to 288 and continue with: 2887 / 866

Advancing to step 5:
866 goes into 2887 3 times with a remainder of 289.
Write down 3 as next digit of the result. 
Result so far: 33.0
The remainder is 289 after subtracting 2598 from 2887.
Bring next digit (6) of the dividend behind the 289 and repeat the process: 2896 / 866

On to step 6:
866 can be fit into 2896 3 times, resulting in a remainder of 298.
Put 3 as the next digit of the answer. 
Result so far: 333.0
Subtracting 2598 from 2896 leaves us with 298.
Take the next digit (8) from the dividend and append it to 298, then repeat: 2988 / 866

Advancing to step 7:
866 can be fit into 2988 3 times, resulting in a remainder of 390.
Write down 3 as next digit of the result. 
Result so far: 3333.0
If we take 2598 away from 2988, we end up with 390.
Include the next digit (7) from the dividend after 390, then repeat: 3907 / 866

Going ahead to step 8:
If we divide 3907 by 866, we get 4 and a remainder of 443.
The next digit of our result is 4. 
Result so far: 33334.0
The remainder is 443 after subtracting 3464 from 3907.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4430, and continue the process.

Let's proceed to step 9:
The number 866 fits into 4430 5 times, leaving a remainder of 100.
Put 5 as the next digit of the answer. 
Result so far: 33334.5
Deduct 4330 from 4430 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Going ahead to step 10:
If we divide 1000 by 866, we get 1 and a remainder of 134.
Write down 1 as next digit of the result. 
Result so far: 33334.51
If we subtract 866 from 1000, we get 134.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1340, and continue the process.

Step 11:
866 goes into 1340 1 times with a remainder of 474.
Record the quotient 1 as the next digit in the result. 
Result so far: 33334.511
The remainder is 474 after subtracting 866 from 1340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4740, and continue the process.

The final outcome is 33334.511, with a leftover of 0.0474.