646358 divided by 28 
The aim is to understand the frequency of 28 in 646358.

Advancing to step 1:
If we divide 6 by 28, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 28

Moving on to step 2:
The number 28 fits into 64 2 times, leaving a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 56 from 64 leaves us with 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 28

Advancing to step 3:
28 goes into 86 3 times with a remainder of 2.
Put 3 as the next digit of the answer. 
Result so far: 23.0
The remainder is 2 after subtracting 84 from 86.
Fetch the next digit (3) from the dividend, attach it to 2 and continue: 23 / 28

On to step 4:
When dividing 23 by 28, we get 0 with a remainder of 23.
Record the quotient 0 as the next digit in the result. 
Result so far: 230.0
Deduct 0 from 23 and we're left with 23.
Bring next digit (5) of the dividend behind the 23 and repeat the process: 235 / 28

Step 5:
The number 28 fits into 235 8 times, leaving a remainder of 11.
The next digit of our result is 8. 
Result so far: 2308.0
If we take 224 away from 235, we end up with 11.
Append the next digit (8) from the dividend to 11 and continue with: 118 / 28

Step 6:
The number 28 fits into 118 4 times, leaving a remainder of 6.
The next digit of our result is 4. 
Result so far: 23084.0
Subtracting 112 from 118 leaves us 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.

Let's proceed to step 7:
The number 28 fits into 60 2 times, leaving a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 23084.2
If we subtract 56 from 60, we get 4.
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 8:
If we divide 40 by 28, we get 1 and a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 23084.21
If we take 28 away from 40, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 9:
If we divide 120 by 28, we get 4 and a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 23084.214
Deduct 112 from 120 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 10:
If we divide 80 by 28, we get 2 and a remainder of 24.
Record the quotient 2 as the next digit in the result. 
Result so far: 23084.2142
Subtracting 56 from 80 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 11:
28 goes into 240 8 times with a remainder of 16.
Write down 8 as next digit of the result. 
Result so far: 23084.21428
Subtract 224 from 240 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 12:
28 goes into 160 5 times with a remainder of 20.
Record the quotient 5 as the next digit in the result. 
Result so far: 23084.214285
The remainder is 20 after subtracting 140 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 13:
If we divide 200 by 28, we get 7 and a remainder of 4.
Use 7 as the next digit of our solution. 
Result so far: 23084.2142857
Deduct 196 from 200 and we're left 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.

Going ahead to step 14:
28 can be fit into 40 1 times, resulting in a remainder of 12.
Record the quotient 1 as the next digit in the result. 
Result so far: 23084.21428571
Subtract 28 from 40 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

After the division, we end up with 23084.21428571 and a remainder of 1.2e-08.