We look at the division of 28403788 by 641 
The aim is to understand the frequency of 641 in 28403788.

Going ahead to step 1:
2 divided by 641 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (8) from the dividend to 2 and continue with: 28 / 641

On to step 2:
If we divide 28 by 641, we get 0 and a remainder of 28.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 28 to get 28.
Grab the next digit (4) from the dividend, add it to 28, then carry on: 284 / 641

Moving on to step 3:
284 divided by 641 is 0 with a remainder of 284.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 284 leaves us with 284.
Include the next digit (0) from the dividend after 284, then repeat: 2840 / 641

On to step 4:
641 can be fit into 2840 4 times, resulting in a remainder of 276.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 276 after subtracting 2564 from 2840.
Fetch the next digit (3) from the dividend, attach it to 276 and continue: 2763 / 641

On to step 5:
When dividing 2763 by 641, we get 4 with a remainder of 199.
The next digit of our result is 4. 
Result so far: 44.0
If we take 2564 away from 2763, we end up with 199.
Take the next digit (7) from the dividend and append it to 199, then repeat: 1997 / 641

Moving on to step 6:
When dividing 1997 by 641, we get 3 with a remainder of 74.
Record the quotient 3 as the next digit in the result. 
Result so far: 443.0
If we subtract 1923 from 1997, we get 74.
Grab the next digit (8) from the dividend, add it to 74, then carry on: 748 / 641

Moving on to step 7:
748 divided by 641 is 1 with a remainder of 107.
Record the quotient 1 as the next digit in the result. 
Result so far: 4431.0
The remainder is 107 after subtracting 641 from 748.
Fetch the next digit (8) from the dividend, attach it to 107 and continue: 1078 / 641

On to step 8:
641 can be fit into 1078 1 times, resulting in a remainder of 437.
Record the quotient 1 as the next digit in the result. 
Result so far: 44311.0
Subtracting 641 from 1078 leaves us with 437.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4370, and continue the process.

Going ahead to step 9:
The number 641 fits into 4370 6 times, leaving a remainder of 524.
Put 6 as the next digit of the answer. 
Result so far: 44311.6
Deduct 3846 from 4370 and we're left with 524.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5240, and continue the process.

On to step 10:
When dividing 5240 by 641, we get 8 with a remainder of 112.
Write down 8 as next digit of the result. 
Result so far: 44311.68
Subtracting 5128 from 5240 leaves us with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Advancing to step 11:
641 can be fit into 1120 1 times, resulting in a remainder of 479.
Put 1 as the next digit of the answer. 
Result so far: 44311.681
Subtracting 641 from 1120 leaves us with 479.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4790, and continue the process.

On to step 12:
641 can be fit into 4790 7 times, resulting in a remainder of 303.
Use 7 as the next digit of our solution. 
Result so far: 44311.6817
If we subtract 4487 from 4790, we get 303.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3030, and continue the process.

Going ahead to step 13:
3030 divided by 641 is 4 with a remainder of 466.
The number 4 becomes the next digit in our result. 
Result so far: 44311.68174
If we take 2564 away from 3030, we end up with 466.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4660, and continue the process.

On to step 14:
641 can be fit into 4660 7 times, resulting in a remainder of 173.
The next digit of our result is 7. 
Result so far: 44311.681747
Deduct 4487 from 4660 and we're left with 173.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1730, and continue the process.

Going ahead to step 15:
If we divide 1730 by 641, we get 2 and a remainder of 448.
Record the quotient 2 as the next digit in the result. 
Result so far: 44311.6817472
If we subtract 1282 from 1730, we get 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

On to step 16:
If we divide 4480 by 641, we get 6 and a remainder of 634.
Write down 6 as next digit of the result. 
Result so far: 44311.68174726
If we subtract 3846 from 4480, we get 634.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6340, and continue the process.

The quotient of the division is 44311.68174726, and the remainder is 6.34e-07.