We look at the division of 78605871 by 491 
The aim is to understand the frequency of 491 in 78605871.

On to step 1:
When dividing 7 by 491, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 491

Let's proceed to step 2:
If we divide 78 by 491, we get 0 and a remainder of 78.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Grab the next digit (6) from the dividend, add it to 78, then carry on: 786 / 491

Let's proceed to step 3:
If we divide 786 by 491, we get 1 and a remainder of 295.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 491 away from 786, we end up with 295.
Take the next digit (0) from the dividend and append it to 295, then repeat: 2950 / 491

Moving on to step 4:
When dividing 2950 by 491, we get 6 with a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 16.0
The remainder is 4 after subtracting 2946 from 2950.
Fetch the next digit (5) from the dividend, attach it to 4 and continue: 45 / 491

Advancing to step 5:
The number 491 fits into 45 0 times, leaving a remainder of 45.
Put 0 as the next digit of the answer. 
Result so far: 160.0
The remainder is 45 after subtracting 0 from 45.
Bring next digit (8) of the dividend behind the 45 and repeat the process: 458 / 491

On to step 6:
When dividing 458 by 491, we get 0 with a remainder of 458.
The number 0 becomes the next digit in our result. 
Result so far: 1600.0
The remainder is 458 after subtracting 0 from 458.
Grab the next digit (7) from the dividend, add it to 458, then carry on: 4587 / 491

Step 7:
When dividing 4587 by 491, we get 9 with a remainder of 168.
The number 9 becomes the next digit in our result. 
Result so far: 16009.0
Subtract 4419 from 4587 to get 168.
Include the next digit (1) from the dividend after 168, then repeat: 1681 / 491

Moving on to step 8:
When dividing 1681 by 491, we get 3 with a remainder of 208.
Use 3 as the next digit of our solution. 
Result so far: 160093.0
If we take 1473 away from 1681, we end up with 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Going ahead to step 9:
491 goes into 2080 4 times with a remainder of 116.
Put 4 as the next digit of the answer. 
Result so far: 160093.4
The remainder is 116 after subtracting 1964 from 2080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

On to step 10:
When dividing 1160 by 491, we get 2 with a remainder of 178.
Write down 2 as next digit of the result. 
Result so far: 160093.42
Subtract 982 from 1160 to get 178.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1780, and continue the process.

Going ahead to step 11:
1780 divided by 491 is 3 with a remainder of 307.
The next digit of our result is 3. 
Result so far: 160093.423
The remainder is 307 after subtracting 1473 from 1780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3070, and continue the process.

Let's proceed to step 12:
491 can be fit into 3070 6 times, resulting in a remainder of 124.
The number 6 becomes the next digit in our result. 
Result so far: 160093.4236
If we take 2946 away from 3070, we end up with 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Going ahead to step 13:
When dividing 1240 by 491, we get 2 with a remainder of 258.
Use 2 as the next digit of our solution. 
Result so far: 160093.42362
Subtract 982 from 1240 to get 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Let's proceed to step 14:
491 goes into 2580 5 times with a remainder of 125.
The next digit of our result is 5. 
Result so far: 160093.423625
Deduct 2455 from 2580 and we're left with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Advancing to step 15:
1250 divided by 491 is 2 with a remainder of 268.
The number 2 becomes the next digit in our result. 
Result so far: 160093.4236252
If we take 982 away from 1250, we end up with 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Going ahead to step 16:
If we divide 2680 by 491, we get 5 and a remainder of 225.
The number 5 becomes the next digit in our result. 
Result so far: 160093.42362525
Subtracting 2455 from 2680 leaves us with 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

After the division, we end up with 160093.42362525 and a remainder of 2.25e-07.