13491389 divided by 870 
Let's see how many times 870 fits into 13491389.

Moving on to step 1:
1 divided by 870 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 870

Going ahead to step 2:
870 goes into 13 0 times with a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 13 after subtracting 0 from 13.
Fetch the next digit (4) from the dividend, attach it to 13 and continue: 134 / 870

Moving on to step 3:
870 can be fit into 134 0 times, resulting in a remainder of 134.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 134 to get 134.
Include the next digit (9) from the dividend after 134, then repeat: 1349 / 870

Moving on to step 4:
If we divide 1349 by 870, we get 1 and a remainder of 479.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 479 after subtracting 870 from 1349.
Include the next digit (1) from the dividend after 479, then repeat: 4791 / 870

Let's proceed to step 5:
The number 870 fits into 4791 5 times, leaving a remainder of 441.
Write down 5 as next digit of the result. 
Result so far: 15.0
Subtracting 4350 from 4791 leaves us with 441.
Grab the next digit (3) from the dividend, add it to 441, then carry on: 4413 / 870

Advancing to step 6:
If we divide 4413 by 870, we get 5 and a remainder of 63.
Put 5 as the next digit of the answer. 
Result so far: 155.0
If we take 4350 away from 4413, we end up with 63.
Bring next digit (8) of the dividend behind the 63 and repeat the process: 638 / 870

Let's proceed to step 7:
The number 870 fits into 638 0 times, leaving a remainder of 638.
The next digit of our result is 0. 
Result so far: 1550.0
If we subtract 0 from 638, we get 638.
Include the next digit (9) from the dividend after 638, then repeat: 6389 / 870

Step 8:
6389 divided by 870 is 7 with a remainder of 299.
The number 7 becomes the next digit in our result. 
Result so far: 15507.0
If we subtract 6090 from 6389, we get 299.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2990, and continue the process.

Going ahead to step 9:
When dividing 2990 by 870, we get 3 with a remainder of 380.
Record the quotient 3 as the next digit in the result. 
Result so far: 15507.3
Subtracting 2610 from 2990 leaves us with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Step 10:
If we divide 3800 by 870, we get 4 and a remainder of 320.
Use 4 as the next digit of our solution. 
Result so far: 15507.34
Subtract 3480 from 3800 to get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Let's proceed to step 11:
The number 870 fits into 3200 3 times, leaving a remainder of 590.
Use 3 as the next digit of our solution. 
Result so far: 15507.343
If we take 2610 away from 3200, we end up with 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5900, and continue the process.

Moving on to step 12:
870 can be fit into 5900 6 times, resulting in a remainder of 680.
The number 6 becomes the next digit in our result. 
Result so far: 15507.3436
The remainder is 680 after subtracting 5220 from 5900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

Advancing to step 13:
6800 divided by 870 is 7 with a remainder of 710.
The next digit of our result is 7. 
Result so far: 15507.34367
Subtract 6090 from 6800 to get 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7100, and continue the process.

On to step 14:
870 can be fit into 7100 8 times, resulting in a remainder of 140.
Record the quotient 8 as the next digit in the result. 
Result so far: 15507.343678
Subtracting 6960 from 7100 leaves us with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Moving on to step 15:
870 goes into 1400 1 times with a remainder of 530.
Use 1 as the next digit of our solution. 
Result so far: 15507.3436781
Subtract 870 from 1400 to get 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

Moving on to step 16:
5300 divided by 870 is 6 with a remainder of 80.
Record the quotient 6 as the next digit in the result. 
Result so far: 15507.34367816
The remainder is 80 after subtracting 5220 from 5300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

In conclusion, the division gives 15507.34367816 with a balance of 8e-08.