We're dividing 864686 by 13 
The aim is to understand the frequency of 13 in 864686.

Moving on to step 1:
When dividing 8 by 13, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 13

Step 2:
When dividing 86 by 13, we get 6 with a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtract 78 from 86 to get 8.
Include the next digit (4) from the dividend after 8, then repeat: 84 / 13

On to step 3:
When dividing 84 by 13, we get 6 with a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 66.0
If we take 78 away from 84, we end up with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 13

Moving on to step 4:
13 can be fit into 66 5 times, resulting in a remainder of 1.
The number 5 becomes the next digit in our result. 
Result so far: 665.0
Deduct 65 from 66 and we're left with 1.
Fetch the next digit (8) from the dividend, attach it to 1 and continue: 18 / 13

Advancing to step 5:
18 divided by 13 is 1 with a remainder of 5.
Put 1 as the next digit of the answer. 
Result so far: 6651.0
The remainder is 5 after subtracting 13 from 18.
Fetch the next digit (6) from the dividend, attach it to 5 and continue: 56 / 13

Advancing to step 6:
The number 13 fits into 56 4 times, leaving a remainder of 4.
The next digit of our result is 4. 
Result so far: 66514.0
The remainder is 4 after subtracting 52 from 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 7:
40 divided by 13 is 3 with a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 66514.3
The remainder is 1 after subtracting 39 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 8:
The number 13 fits into 10 0 times, leaving a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 66514.3
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 9:
100 divided by 13 is 7 with a remainder of 9.
Put 7 as the next digit of the answer. 
Result so far: 66514.307
Deduct 91 from 100 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 10:
90 divided by 13 is 6 with a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 66514.3076
The remainder is 12 after subtracting 78 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 11:
If we divide 120 by 13, we get 9 and a remainder of 3.
The next digit of our result is 9. 
Result so far: 66514.30769
Deduct 117 from 120 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 12:
If we divide 30 by 13, we get 2 and a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 66514.307692
If we take 26 away from 30, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 13:
When dividing 40 by 13, we get 3 with a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 66514.3076923
The remainder is 1 after subtracting 39 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 14:
If we divide 10 by 13, we get 0 and a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 66514.3076923
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 66514.3076923, with a leftover of 1e-08.