644464 ÷ 28 
Let's see how many times 28 fits into 644464.

Moving on to step 1:
The number 28 fits into 6 0 times, leaving a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 28

Moving on to step 2:
If we divide 64 by 28, we get 2 and a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 56 away from 64, we end up with 8.
Take the next digit (4) from the dividend and append it to 8, then repeat: 84 / 28

Advancing to step 3:
28 can be fit into 84 3 times, resulting in a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 23.0
Subtract 84 from 84 to get 0.
Append the next digit (4) from the dividend to 0 and continue with: 4 / 28

Moving on to step 4:
4 divided by 28 is 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 230.0
If we subtract 0 from 4, we get 4.
Append the next digit (6) from the dividend to 4 and continue with: 46 / 28

Going ahead to step 5:
The number 28 fits into 46 1 times, leaving a remainder of 18.
Use 1 as the next digit of our solution. 
Result so far: 2301.0
If we subtract 28 from 46, we get 18.
Bring next digit (4) of the dividend behind the 18 and repeat the process: 184 / 28

On to step 6:
184 divided by 28 is 6 with a remainder of 16.
Use 6 as the next digit of our solution. 
Result so far: 23016.0
Deduct 168 from 184 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 7:
If we divide 160 by 28, we get 5 and a remainder of 20.
Write down 5 as next digit of the result. 
Result so far: 23016.5
If we subtract 140 from 160, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 8:
200 divided by 28 is 7 with a remainder of 4.
Use 7 as the next digit of our solution. 
Result so far: 23016.57
Subtracting 196 from 200 leaves us 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.

Let's proceed to step 9:
The number 28 fits into 40 1 times, leaving a remainder of 12.
Record the quotient 1 as the next digit in the result. 
Result so far: 23016.571
If we subtract 28 from 40, we 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.

Step 10:
28 can be fit into 120 4 times, resulting in a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 23016.5714
Subtracting 112 from 120 leaves us 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.

Let's proceed to step 11:
The number 28 fits into 80 2 times, leaving a remainder of 24.
Put 2 as the next digit of the answer. 
Result so far: 23016.57142
Deduct 56 from 80 and we're left 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 12:
When dividing 240 by 28, we get 8 with a remainder of 16.
The next digit of our result is 8. 
Result so far: 23016.571428
If we take 224 away from 240, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 13:
160 divided by 28 is 5 with a remainder of 20.
Put 5 as the next digit of the answer. 
Result so far: 23016.5714285
If we take 140 away from 160, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 14:
28 can be fit into 200 7 times, resulting in a remainder of 4.
Use 7 as the next digit of our solution. 
Result so far: 23016.57142857
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.

The final outcome is 23016.57142857, with a leftover of 4e-09.