A:
Positive:
1 x 388813855 x 777627723 x 1690495115 x 338099557 x 69805607 x 640552785 x 139613035 x 12811
Negative:
-1 x -38881385-5 x -7776277-23 x -1690495-115 x -338099-557 x -69805-607 x -64055-2785 x -13961-3035 x -12811
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 38,881,385, 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 | 38,881,385 | |
| -1 | -38,881,385 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 38,881,385.
Example:
1 x 38,881,385 = 38,881,385
and
-1 x -38,881,385 = 38,881,385
Notice both answers equal 38,881,385
With that explanation out of the way, let's continue. Next, we take the number 38,881,385 and divide it by 2:
38,881,385 ÷ 2 = 19,440,692.5
If the quotient is a whole number, then 2 and 19,440,692.5 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 | 38,881,385 | |
| -1 | -38,881,385 |
Now, we try dividing 38,881,385 by 3:
38,881,385 ÷ 3 = 12,960,461.6667
If the quotient is a whole number, then 3 and 12,960,461.6667 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 | 38,881,385 | |
| -1 | -38,881,385 |
Let's try dividing by 4:
38,881,385 ÷ 4 = 9,720,346.25
If the quotient is a whole number, then 4 and 9,720,346.25 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 | 38,881,385 | |
| -1 | 38,881,385 |
If you did it right, you will end up with this table:
| 1 | 5 | 23 | 115 | 557 | 607 | 2,785 | 3,035 | 12,811 | 13,961 | 64,055 | 69,805 | 338,099 | 1,690,495 | 7,776,277 | 38,881,385 |
| -1 | -5 | -23 | -115 | -557 | -607 | -2,785 | -3,035 | -12,811 | -13,961 | -64,055 | -69,805 | -338,099 | -1,690,495 | -7,776,277 | -38,881,385 |
Here are some more numbers to try:
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