A:
Positive:
1 x 15687132161 x 257166167 x 2341363131 x 1197491293 x 5353974087 x 383837991 x 196318777 x 17873
Negative:
-1 x -156871321-61 x -2571661-67 x -2341363-131 x -1197491-293 x -535397-4087 x -38383-7991 x -19631-8777 x -17873
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 156,871,321, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 156,871,321 | |
| -1 | -156,871,321 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 156,871,321.
Example:
1 x 156,871,321 = 156,871,321
and
-1 x -156,871,321 = 156,871,321
Notice both answers equal 156,871,321
With that explanation out of the way, let's continue. Next, we take the number 156,871,321 and divide it by 2:
156,871,321 ÷ 2 = 78,435,660.5
If the quotient is a whole number, then 2 and 78,435,660.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 156,871,321 | |
| -1 | -156,871,321 |
Now, we try dividing 156,871,321 by 3:
156,871,321 ÷ 3 = 52,290,440.3333
If the quotient is a whole number, then 3 and 52,290,440.3333 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 156,871,321 | |
| -1 | -156,871,321 |
Let's try dividing by 4:
156,871,321 ÷ 4 = 39,217,830.25
If the quotient is a whole number, then 4 and 39,217,830.25 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 156,871,321 | |
| -1 | 156,871,321 |
If you did it right, you will end up with this table:
| 1 | 61 | 67 | 131 | 293 | 4,087 | 7,991 | 8,777 | 17,873 | 19,631 | 38,383 | 535,397 | 1,197,491 | 2,341,363 | 2,571,661 | 156,871,321 |
| -1 | -61 | -67 | -131 | -293 | -4,087 | -7,991 | -8,777 | -17,873 | -19,631 | -38,383 | -535,397 | -1,197,491 | -2,341,363 | -2,571,661 | -156,871,321 |
Here are some more numbers to try:
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