27391270 ÷ 644 
We want to divide 27391270 by 644.

Step 1:
2 divided by 644 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (7) of the dividend behind the 2 and repeat the process: 27 / 644

Going ahead to step 2:
644 goes into 27 0 times with a remainder of 27.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 27 to get 27.
Bring next digit (3) of the dividend behind the 27 and repeat the process: 273 / 644

Moving on to step 3:
644 can be fit into 273 0 times, resulting in a remainder of 273.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 273 and we're left with 273.
Include the next digit (9) from the dividend after 273, then repeat: 2739 / 644

Step 4:
The number 644 fits into 2739 4 times, leaving a remainder of 163.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we subtract 2576 from 2739, we get 163.
Fetch the next digit (1) from the dividend, attach it to 163 and continue: 1631 / 644

Step 5:
When dividing 1631 by 644, we get 2 with a remainder of 343.
Write down 2 as next digit of the result. 
Result so far: 42.0
Subtract 1288 from 1631 to get 343.
Include the next digit (2) from the dividend after 343, then repeat: 3432 / 644

On to step 6:
3432 divided by 644 is 5 with a remainder of 212.
The next digit of our result is 5. 
Result so far: 425.0
Subtract 3220 from 3432 to get 212.
Include the next digit (7) from the dividend after 212, then repeat: 2127 / 644

Going ahead to step 7:
The number 644 fits into 2127 3 times, leaving a remainder of 195.
Write down 3 as next digit of the result. 
Result so far: 4253.0
Deduct 1932 from 2127 and we're left with 195.
Grab the next digit (0) from the dividend, add it to 195, then carry on: 1950 / 644

Let's proceed to step 8:
The number 644 fits into 1950 3 times, leaving a remainder of 18.
Record the quotient 3 as the next digit in the result. 
Result so far: 42533.0
The remainder is 18 after subtracting 1932 from 1950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 9:
When dividing 180 by 644, we get 0 with a remainder of 180.
Use 0 as the next digit of our solution. 
Result so far: 42533.0
If we take 0 away from 180, we end up with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Going ahead to step 10:
If we divide 1800 by 644, we get 2 and a remainder of 512.
Use 2 as the next digit of our solution. 
Result so far: 42533.02
Subtract 1288 from 1800 to get 512.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5120, and continue the process.

Advancing to step 11:
The number 644 fits into 5120 7 times, leaving a remainder of 612.
The next digit of our result is 7. 
Result so far: 42533.027
If we take 4508 away from 5120, we end up with 612.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6120, and continue the process.

On to step 12:
644 goes into 6120 9 times with a remainder of 324.
Use 9 as the next digit of our solution. 
Result so far: 42533.0279
The remainder is 324 after subtracting 5796 from 6120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3240, and continue the process.

Going ahead to step 13:
644 can be fit into 3240 5 times, resulting in a remainder of 20.
Write down 5 as next digit of the result. 
Result so far: 42533.02795
Subtract 3220 from 3240 to 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.

Step 14:
644 goes into 200 0 times with a remainder of 200.
The next digit of our result is 0. 
Result so far: 42533.02795
The remainder is 200 after subtracting 0 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Going ahead to step 15:
If we divide 2000 by 644, we get 3 and a remainder of 68.
Use 3 as the next digit of our solution. 
Result so far: 42533.0279503
If we subtract 1932 from 2000, we get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Advancing to step 16:
680 divided by 644 is 1 with a remainder of 36.
Put 1 as the next digit of the answer. 
Result so far: 42533.02795031
Subtract 644 from 680 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

In conclusion, the division gives 42533.02795031 with a balance of 3.6e-08.