A:
Positive:
1 x 7215173911 x 655924929 x 248799137 x 1950047319 x 226181407 x 1772771073 x 672436113 x 11803
Negative:
-1 x -72151739-11 x -6559249-29 x -2487991-37 x -1950047-319 x -226181-407 x -177277-1073 x -67243-6113 x -11803
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 72,151,739, 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 | 72,151,739 | |
| -1 | -72,151,739 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 72,151,739.
Example:
1 x 72,151,739 = 72,151,739
and
-1 x -72,151,739 = 72,151,739
Notice both answers equal 72,151,739
With that explanation out of the way, let's continue. Next, we take the number 72,151,739 and divide it by 2:
72,151,739 ÷ 2 = 36,075,869.5
If the quotient is a whole number, then 2 and 36,075,869.5 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 | 72,151,739 | |
| -1 | -72,151,739 |
Now, we try dividing 72,151,739 by 3:
72,151,739 ÷ 3 = 24,050,579.6667
If the quotient is a whole number, then 3 and 24,050,579.6667 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 | 72,151,739 | |
| -1 | -72,151,739 |
Let's try dividing by 4:
72,151,739 ÷ 4 = 18,037,934.75
If the quotient is a whole number, then 4 and 18,037,934.75 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 | 72,151,739 | |
| -1 | 72,151,739 |
If you did it right, you will end up with this table:
| 1 | 11 | 29 | 37 | 319 | 407 | 1,073 | 6,113 | 11,803 | 67,243 | 177,277 | 226,181 | 1,950,047 | 2,487,991 | 6,559,249 | 72,151,739 |
| -1 | -11 | -29 | -37 | -319 | -407 | -1,073 | -6,113 | -11,803 | -67,243 | -177,277 | -226,181 | -1,950,047 | -2,487,991 | -6,559,249 | -72,151,739 |
Here are some more numbers to try:
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