We look at the division of 16087870 by 648 
The aim is to understand the frequency of 648 in 16087870.

Going ahead to step 1:
648 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (6) from the dividend, attach it to 1 and continue: 16 / 648

Step 2:
The number 648 fits into 16 0 times, leaving a remainder of 16.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 16 leaves us with 16.
Take the next digit (0) from the dividend and append it to 16, then repeat: 160 / 648

Moving on to step 3:
The number 648 fits into 160 0 times, leaving a remainder of 160.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 160 to get 160.
Append the next digit (8) from the dividend to 160 and continue with: 1608 / 648

Step 4:
The number 648 fits into 1608 2 times, leaving a remainder of 312.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 312 after subtracting 1296 from 1608.
Append the next digit (7) from the dividend to 312 and continue with: 3127 / 648

Let's proceed to step 5:
If we divide 3127 by 648, we get 4 and a remainder of 535.
Record the quotient 4 as the next digit in the result. 
Result so far: 24.0
If we take 2592 away from 3127, we end up with 535.
Bring next digit (8) of the dividend behind the 535 and repeat the process: 5358 / 648

Step 6:
When dividing 5358 by 648, we get 8 with a remainder of 174.
The number 8 becomes the next digit in our result. 
Result so far: 248.0
If we take 5184 away from 5358, we end up with 174.
Fetch the next digit (7) from the dividend, attach it to 174 and continue: 1747 / 648

Advancing to step 7:
648 can be fit into 1747 2 times, resulting in a remainder of 451.
Use 2 as the next digit of our solution. 
Result so far: 2482.0
If we subtract 1296 from 1747, we get 451.
Grab the next digit (0) from the dividend, add it to 451, then carry on: 4510 / 648

Moving on to step 8:
When dividing 4510 by 648, we get 6 with a remainder of 622.
Write down 6 as next digit of the result. 
Result so far: 24826.0
Deduct 3888 from 4510 and we're left with 622.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6220, and continue the process.

Advancing to step 9:
When dividing 6220 by 648, we get 9 with a remainder of 388.
Record the quotient 9 as the next digit in the result. 
Result so far: 24826.9
The remainder is 388 after subtracting 5832 from 6220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

Going ahead to step 10:
When dividing 3880 by 648, we get 5 with a remainder of 640.
Write down 5 as next digit of the result. 
Result so far: 24826.95
Deduct 3240 from 3880 and we're left with 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Going ahead to step 11:
648 can be fit into 6400 9 times, resulting in a remainder of 568.
The next digit of our result is 9. 
Result so far: 24826.959
Subtract 5832 from 6400 to get 568.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5680, and continue the process.

Moving on to step 12:
If we divide 5680 by 648, we get 8 and a remainder of 496.
The next digit of our result is 8. 
Result so far: 24826.9598
The remainder is 496 after subtracting 5184 from 5680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

On to step 13:
When dividing 4960 by 648, we get 7 with a remainder of 424.
Record the quotient 7 as the next digit in the result. 
Result so far: 24826.95987
If we take 4536 away from 4960, we end up with 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Step 14:
4240 divided by 648 is 6 with a remainder of 352.
Write down 6 as next digit of the result. 
Result so far: 24826.959876
If we take 3888 away from 4240, we end up with 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

On to step 15:
648 can be fit into 3520 5 times, resulting in a remainder of 280.
Put 5 as the next digit of the answer. 
Result so far: 24826.9598765
If we take 3240 away from 3520, we end up with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Step 16:
If we divide 2800 by 648, we get 4 and a remainder of 208.
The next digit of our result is 4. 
Result so far: 24826.95987654
If we take 2592 away from 2800, 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.

Our division results in 24826.95987654 with a remaining 2.08e-07.