A:
Positive:
1 x 7841890917 x 461287719 x 4127311107 x 732887323 x 2427831819 x 431112033 x 385732269 x 34561
Negative:
-1 x -78418909-17 x -4612877-19 x -4127311-107 x -732887-323 x -242783-1819 x -43111-2033 x -38573-2269 x -34561
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 78,418,909, 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 | 78,418,909 | |
| -1 | -78,418,909 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 78,418,909.
Example:
1 x 78,418,909 = 78,418,909
and
-1 x -78,418,909 = 78,418,909
Notice both answers equal 78,418,909
With that explanation out of the way, let's continue. Next, we take the number 78,418,909 and divide it by 2:
78,418,909 ÷ 2 = 39,209,454.5
If the quotient is a whole number, then 2 and 39,209,454.5 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 | 78,418,909 | |
| -1 | -78,418,909 |
Now, we try dividing 78,418,909 by 3:
78,418,909 ÷ 3 = 26,139,636.3333
If the quotient is a whole number, then 3 and 26,139,636.3333 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 | 78,418,909 | |
| -1 | -78,418,909 |
Let's try dividing by 4:
78,418,909 ÷ 4 = 19,604,727.25
If the quotient is a whole number, then 4 and 19,604,727.25 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 | 78,418,909 | |
| -1 | 78,418,909 |
If you did it right, you will end up with this table:
| 1 | 17 | 19 | 107 | 323 | 1,819 | 2,033 | 2,269 | 34,561 | 38,573 | 43,111 | 242,783 | 732,887 | 4,127,311 | 4,612,877 | 78,418,909 |
| -1 | -17 | -19 | -107 | -323 | -1,819 | -2,033 | -2,269 | -34,561 | -38,573 | -43,111 | -242,783 | -732,887 | -4,127,311 | -4,612,877 | -78,418,909 |
Here are some more numbers to try:
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