A:
Positive:
1 x 153875755 x 30775157 x 219822523 x 66902525 x 61550335 x 439645115 x 133805161 x 95575175 x 87929575 x 26761805 x 191153823 x 4025
Negative:
-1 x -15387575-5 x -3077515-7 x -2198225-23 x -669025-25 x -615503-35 x -439645-115 x -133805-161 x -95575-175 x -87929-575 x -26761-805 x -19115-3823 x -4025
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 15,387,575, 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 | 15,387,575 | |
| -1 | -15,387,575 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 15,387,575.
Example:
1 x 15,387,575 = 15,387,575
and
-1 x -15,387,575 = 15,387,575
Notice both answers equal 15,387,575
With that explanation out of the way, let's continue. Next, we take the number 15,387,575 and divide it by 2:
15,387,575 ÷ 2 = 7,693,787.5
If the quotient is a whole number, then 2 and 7,693,787.5 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 | 15,387,575 | |
| -1 | -15,387,575 |
Now, we try dividing 15,387,575 by 3:
15,387,575 ÷ 3 = 5,129,191.6667
If the quotient is a whole number, then 3 and 5,129,191.6667 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 | 15,387,575 | |
| -1 | -15,387,575 |
Let's try dividing by 4:
15,387,575 ÷ 4 = 3,846,893.75
If the quotient is a whole number, then 4 and 3,846,893.75 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 | 15,387,575 | |
| -1 | 15,387,575 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 23 | 25 | 35 | 115 | 161 | 175 | 575 | 805 | 3,823 | 4,025 | 19,115 | 26,761 | 87,929 | 95,575 | 133,805 | 439,645 | 615,503 | 669,025 | 2,198,225 | 3,077,515 | 15,387,575 |
| -1 | -5 | -7 | -23 | -25 | -35 | -115 | -161 | -175 | -575 | -805 | -3,823 | -4,025 | -19,115 | -26,761 | -87,929 | -95,575 | -133,805 | -439,645 | -615,503 | -669,025 | -2,198,225 | -3,077,515 | -15,387,575 |
Here are some more numbers to try:
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