We look at the division of 8420607 by 667 
The aim is to understand the frequency of 667 in 8420607.

Advancing to step 1:
667 goes into 8 0 times with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (4) of the dividend behind the 8 and repeat the process: 84 / 667

Advancing to step 2:
When dividing 84 by 667, we get 0 with a remainder of 84.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 84 to get 84.
Fetch the next digit (2) from the dividend, attach it to 84 and continue: 842 / 667

On to step 3:
If we divide 842 by 667, we get 1 and a remainder of 175.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 175 after subtracting 667 from 842.
Grab the next digit (0) from the dividend, add it to 175, then carry on: 1750 / 667

Moving on to step 4:
If we divide 1750 by 667, we get 2 and a remainder of 416.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtract 1334 from 1750 to get 416.
Take the next digit (6) from the dividend and append it to 416, then repeat: 4166 / 667

On to step 5:
667 can be fit into 4166 6 times, resulting in a remainder of 164.
The next digit of our result is 6. 
Result so far: 126.0
Subtracting 4002 from 4166 leaves us with 164.
Include the next digit (0) from the dividend after 164, then repeat: 1640 / 667

Let's proceed to step 6:
The number 667 fits into 1640 2 times, leaving a remainder of 306.
Write down 2 as next digit of the result. 
Result so far: 1262.0
The remainder is 306 after subtracting 1334 from 1640.
Include the next digit (7) from the dividend after 306, then repeat: 3067 / 667

Let's proceed to step 7:
The number 667 fits into 3067 4 times, leaving a remainder of 399.
The next digit of our result is 4. 
Result so far: 12624.0
The remainder is 399 after subtracting 2668 from 3067.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3990, and continue the process.

Going ahead to step 8:
3990 divided by 667 is 5 with a remainder of 655.
The number 5 becomes the next digit in our result. 
Result so far: 12624.5
If we take 3335 away from 3990, we end up with 655.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6550, and continue the process.

Moving on to step 9:
When dividing 6550 by 667, we get 9 with a remainder of 547.
Record the quotient 9 as the next digit in the result. 
Result so far: 12624.59
Subtracting 6003 from 6550 leaves us with 547.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5470, and continue the process.

Moving on to step 10:
The number 667 fits into 5470 8 times, leaving a remainder of 134.
Put 8 as the next digit of the answer. 
Result so far: 12624.598
The remainder is 134 after subtracting 5336 from 5470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1340, and continue the process.

Let's proceed to step 11:
If we divide 1340 by 667, we get 2 and a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 12624.5982
If we take 1334 away from 1340, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 12:
667 goes into 60 0 times with a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 12624.5982
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 13:
667 goes into 600 0 times with a remainder of 600.
The next digit of our result is 0. 
Result so far: 12624.5982
If we take 0 away from 600, we end up with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

The final outcome is 12624.5982, with a leftover of 6e-05.