A:
Positive:
1 x 382159155 x 764318317 x 224799553 x 72105585 x 449599265 x 144211289 x 132235499 x 76585901 x 424151445 x 264472495 x 153174505 x 8483
Negative:
-1 x -38215915-5 x -7643183-17 x -2247995-53 x -721055-85 x -449599-265 x -144211-289 x -132235-499 x -76585-901 x -42415-1445 x -26447-2495 x -15317-4505 x -8483
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 38,215,915, 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 | 38,215,915 | |
| -1 | -38,215,915 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 38,215,915.
Example:
1 x 38,215,915 = 38,215,915
and
-1 x -38,215,915 = 38,215,915
Notice both answers equal 38,215,915
With that explanation out of the way, let's continue. Next, we take the number 38,215,915 and divide it by 2:
38,215,915 ÷ 2 = 19,107,957.5
If the quotient is a whole number, then 2 and 19,107,957.5 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 | 38,215,915 | |
| -1 | -38,215,915 |
Now, we try dividing 38,215,915 by 3:
38,215,915 ÷ 3 = 12,738,638.3333
If the quotient is a whole number, then 3 and 12,738,638.3333 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 | 38,215,915 | |
| -1 | -38,215,915 |
Let's try dividing by 4:
38,215,915 ÷ 4 = 9,553,978.75
If the quotient is a whole number, then 4 and 9,553,978.75 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 | 38,215,915 | |
| -1 | 38,215,915 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 53 | 85 | 265 | 289 | 499 | 901 | 1,445 | 2,495 | 4,505 | 8,483 | 15,317 | 26,447 | 42,415 | 76,585 | 132,235 | 144,211 | 449,599 | 721,055 | 2,247,995 | 7,643,183 | 38,215,915 |
| -1 | -5 | -17 | -53 | -85 | -265 | -289 | -499 | -901 | -1,445 | -2,495 | -4,505 | -8,483 | -15,317 | -26,447 | -42,415 | -76,585 | -132,235 | -144,211 | -449,599 | -721,055 | -2,247,995 | -7,643,183 | -38,215,915 |
Here are some more numbers to try:
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