87689268 ÷ 639 
We want to figure out the number of times 87689268 can be divided by 639.

Step 1:
8 divided by 639 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 639

Going ahead to step 2:
If we divide 87 by 639, we get 0 and a remainder of 87.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 87 after subtracting 0 from 87.
Include the next digit (6) from the dividend after 87, then repeat: 876 / 639

Advancing to step 3:
876 divided by 639 is 1 with a remainder of 237.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 639 from 876 leaves us with 237.
Fetch the next digit (8) from the dividend, attach it to 237 and continue: 2378 / 639

Going ahead to step 4:
The number 639 fits into 2378 3 times, leaving a remainder of 461.
Put 3 as the next digit of the answer. 
Result so far: 13.0
Deduct 1917 from 2378 and we're left with 461.
Grab the next digit (9) from the dividend, add it to 461, then carry on: 4619 / 639

Advancing to step 5:
The number 639 fits into 4619 7 times, leaving a remainder of 146.
Record the quotient 7 as the next digit in the result. 
Result so far: 137.0
The remainder is 146 after subtracting 4473 from 4619.
Bring next digit (2) of the dividend behind the 146 and repeat the process: 1462 / 639

Step 6:
639 can be fit into 1462 2 times, resulting in a remainder of 184.
Record the quotient 2 as the next digit in the result. 
Result so far: 1372.0
If we take 1278 away from 1462, we end up with 184.
Bring next digit (6) of the dividend behind the 184 and repeat the process: 1846 / 639

Going ahead to step 7:
The number 639 fits into 1846 2 times, leaving a remainder of 568.
The next digit of our result is 2. 
Result so far: 13722.0
If we take 1278 away from 1846, we end up with 568.
Include the next digit (8) from the dividend after 568, then repeat: 5688 / 639

Going ahead to step 8:
5688 divided by 639 is 8 with a remainder of 576.
Use 8 as the next digit of our solution. 
Result so far: 137228.0
If we subtract 5112 from 5688, we get 576.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5760, and continue the process.

Step 9:
5760 divided by 639 is 9 with a remainder of 9.
Write down 9 as next digit of the result. 
Result so far: 137228.9
Deduct 5751 from 5760 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 10:
When dividing 90 by 639, we get 0 with a remainder of 90.
The next digit of our result is 0. 
Result so far: 137228.9
Subtract 0 from 90 to get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

On to step 11:
The number 639 fits into 900 1 times, leaving a remainder of 261.
The next digit of our result is 1. 
Result so far: 137228.901
Subtracting 639 from 900 leaves us with 261.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2610, and continue the process.

Let's proceed to step 12:
The number 639 fits into 2610 4 times, leaving a remainder of 54.
Write down 4 as next digit of the result. 
Result so far: 137228.9014
Subtract 2556 from 2610 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 13:
When dividing 540 by 639, we get 0 with a remainder of 540.
Write down 0 as next digit of the result. 
Result so far: 137228.9014
The remainder is 540 after subtracting 0 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Step 14:
When dividing 5400 by 639, we get 8 with a remainder of 288.
Record the quotient 8 as the next digit in the result. 
Result so far: 137228.901408
The remainder is 288 after subtracting 5112 from 5400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

Going ahead to step 15:
639 can be fit into 2880 4 times, resulting in a remainder of 324.
Put 4 as the next digit of the answer. 
Result so far: 137228.9014084
Deduct 2556 from 2880 and we're left with 324.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3240, and continue the process.

Moving on to step 16:
639 goes into 3240 5 times with a remainder of 45.
Use 5 as the next digit of our solution. 
Result so far: 137228.90140845
Subtracting 3195 from 3240 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

The quotient of the division is 137228.90140845, and the remainder is 4.5e-08.