A:
Positive:
1 x 727812855 x 14556257149 x 488465211 x 344935463 x 157195745 x 976931055 x 689872315 x 31439
Negative:
-1 x -72781285-5 x -14556257-149 x -488465-211 x -344935-463 x -157195-745 x -97693-1055 x -68987-2315 x -31439
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 72,781,285, 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 | 72,781,285 | |
| -1 | -72,781,285 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 72,781,285.
Example:
1 x 72,781,285 = 72,781,285
and
-1 x -72,781,285 = 72,781,285
Notice both answers equal 72,781,285
With that explanation out of the way, let's continue. Next, we take the number 72,781,285 and divide it by 2:
72,781,285 ÷ 2 = 36,390,642.5
If the quotient is a whole number, then 2 and 36,390,642.5 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 | 72,781,285 | |
| -1 | -72,781,285 |
Now, we try dividing 72,781,285 by 3:
72,781,285 ÷ 3 = 24,260,428.3333
If the quotient is a whole number, then 3 and 24,260,428.3333 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 | 72,781,285 | |
| -1 | -72,781,285 |
Let's try dividing by 4:
72,781,285 ÷ 4 = 18,195,321.25
If the quotient is a whole number, then 4 and 18,195,321.25 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 | 72,781,285 | |
| -1 | 72,781,285 |
If you did it right, you will end up with this table:
| 1 | 5 | 149 | 211 | 463 | 745 | 1,055 | 2,315 | 31,439 | 68,987 | 97,693 | 157,195 | 344,935 | 488,465 | 14,556,257 | 72,781,285 |
| -1 | -5 | -149 | -211 | -463 | -745 | -1,055 | -2,315 | -31,439 | -68,987 | -97,693 | -157,195 | -344,935 | -488,465 | -14,556,257 | -72,781,285 |
Here are some more numbers to try:
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