We look at the division of 63986904 by 4 
We're looking to find how many times 4 goes into 63986904.

Step 1:
When dividing 6 by 4, we get 1 with a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 4 from 6 leaves us with 2.
Fetch the next digit (3) from the dividend, attach it to 2 and continue: 23 / 4

Let's proceed to step 2:
The number 4 fits into 23 5 times, leaving a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
The remainder is 3 after subtracting 20 from 23.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 4

Advancing to step 3:
4 goes into 39 9 times with a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 159.0
Subtracting 36 from 39 leaves us with 3.
Include the next digit (8) from the dividend after 3, then repeat: 38 / 4

Let's proceed to step 4:
When dividing 38 by 4, we get 9 with a remainder of 2.
Write down 9 as next digit of the result. 
Result so far: 1599.0
If we take 36 away from 38, we end up with 2.
Grab the next digit (6) from the dividend, add it to 2, then carry on: 26 / 4

Moving on to step 5:
26 divided by 4 is 6 with a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 15996.0
Subtracting 24 from 26 leaves us with 2.
Take the next digit (9) from the dividend and append it to 2, then repeat: 29 / 4

On to step 6:
29 divided by 4 is 7 with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 159967.0
The remainder is 1 after subtracting 28 from 29.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 4

Let's proceed to step 7:
If we divide 10 by 4, we get 2 and a remainder of 2.
The next digit of our result is 2. 
Result so far: 1599672.0
Deduct 8 from 10 and we're left with 2.
Take the next digit (4) from the dividend and append it to 2, then repeat: 24 / 4

Moving on to step 8:
When dividing 24 by 4, we get 6 with a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 15996726.0
If we take 24 away from 24, we end up 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.

Going ahead to step 9:
The number 4 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 15996726.0
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.

Going ahead to step 10:
When dividing 0 by 4, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 15996726.0
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.

The final outcome is 15996726.0, with a leftover of 0.0.