We divide 870591 by 2
We want to divide 870591 by 2.

Going ahead to step 1:
When dividing 8 by 2, we get 4 with a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 4.0
Deduct 8 from 8 and we're left with 0.
Bring next digit (7) of the dividend behind the 0 and repeat the process: 7 / 2

Let's proceed to step 2:
If we divide 7 by 2, we get 3 and a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 43.0
Deduct 6 from 7 and we're left with 1.
Append the next digit (0) from the dividend to 1 and continue with: 10 / 2

Going ahead to step 3:
When dividing 10 by 2, we get 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 435.0
Subtracting 10 from 10 leaves us with 0.
Append the next digit (5) from the dividend to 0 and continue with: 5 / 2

On to step 4:
The number 2 fits into 5 2 times, leaving a remainder of 1.
The next digit of our result is 2. 
Result so far: 4352.0
The remainder is 1 after subtracting 4 from 5.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 2

On to step 5:
The number 2 fits into 19 9 times, leaving a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 43529.0
The remainder is 1 after subtracting 18 from 19.
Bring next digit (1) of the dividend behind the 1 and repeat the process: 11 / 2

Advancing to step 6:
11 divided by 2 is 5 with a remainder of 1.
Write down 5 as next digit of the result. 
Result so far: 435295.0
If we take 10 away from 11, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
2 goes into 10 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 435295.5
Subtract 10 from 10 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
When dividing 0 by 2, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 435295.5
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
2 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 435295.5
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 435295.5 with a remainder of 0.0.