A:
Positive:
1 x 7270521713 x 559270943 x 1690819113 x 643409559 x 1300631151 x 631671469 x 494934859 x 14963
Negative:
-1 x -72705217-13 x -5592709-43 x -1690819-113 x -643409-559 x -130063-1151 x -63167-1469 x -49493-4859 x -14963
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 72,705,217, 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 | 72,705,217 | |
| -1 | -72,705,217 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 72,705,217.
Example:
1 x 72,705,217 = 72,705,217
and
-1 x -72,705,217 = 72,705,217
Notice both answers equal 72,705,217
With that explanation out of the way, let's continue. Next, we take the number 72,705,217 and divide it by 2:
72,705,217 ÷ 2 = 36,352,608.5
If the quotient is a whole number, then 2 and 36,352,608.5 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 | 72,705,217 | |
| -1 | -72,705,217 |
Now, we try dividing 72,705,217 by 3:
72,705,217 ÷ 3 = 24,235,072.3333
If the quotient is a whole number, then 3 and 24,235,072.3333 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 | 72,705,217 | |
| -1 | -72,705,217 |
Let's try dividing by 4:
72,705,217 ÷ 4 = 18,176,304.25
If the quotient is a whole number, then 4 and 18,176,304.25 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 | 72,705,217 | |
| -1 | 72,705,217 |
If you did it right, you will end up with this table:
| 1 | 13 | 43 | 113 | 559 | 1,151 | 1,469 | 4,859 | 14,963 | 49,493 | 63,167 | 130,063 | 643,409 | 1,690,819 | 5,592,709 | 72,705,217 |
| -1 | -13 | -43 | -113 | -559 | -1,151 | -1,469 | -4,859 | -14,963 | -49,493 | -63,167 | -130,063 | -643,409 | -1,690,819 | -5,592,709 | -72,705,217 |
Here are some more numbers to try:
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