We're dividing 28506973 by 686 
The aim is to understand the frequency of 686 in 28506973.

Step 1:
If we divide 2 by 686, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Include the next digit (8) from the dividend after 2, then repeat: 28 / 686

Moving on to step 2:
When dividing 28 by 686, we get 0 with a remainder of 28.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 28, we get 28.
Grab the next digit (5) from the dividend, add it to 28, then carry on: 285 / 686

Step 3:
When dividing 285 by 686, we get 0 with a remainder of 285.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 285, we get 285.
Include the next digit (0) from the dividend after 285, then repeat: 2850 / 686

Let's proceed to step 4:
The number 686 fits into 2850 4 times, leaving a remainder of 106.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtracting 2744 from 2850 leaves us with 106.
Include the next digit (6) from the dividend after 106, then repeat: 1066 / 686

On to step 5:
686 goes into 1066 1 times with a remainder of 380.
Record the quotient 1 as the next digit in the result. 
Result so far: 41.0
The remainder is 380 after subtracting 686 from 1066.
Grab the next digit (9) from the dividend, add it to 380, then carry on: 3809 / 686

On to step 6:
The number 686 fits into 3809 5 times, leaving a remainder of 379.
Put 5 as the next digit of the answer. 
Result so far: 415.0
If we take 3430 away from 3809, we end up with 379.
Grab the next digit (7) from the dividend, add it to 379, then carry on: 3797 / 686

Advancing to step 7:
3797 divided by 686 is 5 with a remainder of 367.
The number 5 becomes the next digit in our result. 
Result so far: 4155.0
Subtracting 3430 from 3797 leaves us with 367.
Include the next digit (3) from the dividend after 367, then repeat: 3673 / 686

Advancing to step 8:
If we divide 3673 by 686, we get 5 and a remainder of 243.
Write down 5 as next digit of the result. 
Result so far: 41555.0
Deduct 3430 from 3673 and we're left with 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

Advancing to step 9:
The number 686 fits into 2430 3 times, leaving a remainder of 372.
Use 3 as the next digit of our solution. 
Result so far: 41555.3
The remainder is 372 after subtracting 2058 from 2430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Going ahead to step 10:
3720 divided by 686 is 5 with a remainder of 290.
Put 5 as the next digit of the answer. 
Result so far: 41555.35
Deduct 3430 from 3720 and we're left with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Let's proceed to step 11:
686 goes into 2900 4 times with a remainder of 156.
Use 4 as the next digit of our solution. 
Result so far: 41555.354
The remainder is 156 after subtracting 2744 from 2900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

Advancing to step 12:
When dividing 1560 by 686, we get 2 with a remainder of 188.
Write down 2 as next digit of the result. 
Result so far: 41555.3542
Deduct 1372 from 1560 and we're left with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Step 13:
686 can be fit into 1880 2 times, resulting in a remainder of 508.
Record the quotient 2 as the next digit in the result. 
Result so far: 41555.35422
Deduct 1372 from 1880 and we're left with 508.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5080, and continue the process.

The quotient of the division is 41555.35422, and the remainder is 0.000508.