878591 divided by 2 
We want to figure out the number of times 878591 can be divided by 2.

Advancing to step 1:
When dividing 8 by 2, we get 4 with a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtract 8 from 8 to get 0.
Fetch the next digit (7) from the dividend, attach it to 0 and continue: 7 / 2

On to step 2:
7 divided by 2 is 3 with a remainder of 1.
The next digit of our result is 3. 
Result so far: 43.0
Deduct 6 from 7 and we're left with 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 2

Moving on to step 3:
2 can be fit into 18 9 times, resulting in a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 439.0
If we subtract 18 from 18, we get 0.
Grab the next digit (5) from the dividend, add it to 0, then carry on: 5 / 2

Step 4:
2 goes into 5 2 times with a remainder of 1.
The next digit of our result is 2. 
Result so far: 4392.0
Deduct 4 from 5 and we're left with 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 2

Let's proceed to step 5:
2 goes into 19 9 times with a remainder of 1.
The next digit of our result is 9. 
Result so far: 43929.0
Subtracting 18 from 19 leaves us with 1.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 2

Moving on to step 6:
The number 2 fits into 11 5 times, leaving a remainder of 1.
Use 5 as the next digit of our solution. 
Result so far: 439295.0
Subtract 10 from 11 to get 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.
The number 5 becomes the next digit in our result. 
Result so far: 439295.5
Subtracting 10 from 10 leaves us 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.

Advancing to step 8:
2 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 439295.5
Subtracting 0 from 0 leaves us 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.

On to step 9:
When dividing 0 by 2, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 439295.5
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 439295.5 and a remainder of 0.0.