A:
Positive:
1 x 1557885117 x 91640361 x 25539183 x 187697181 x 860711037 x 150231411 x 110413077 x 5063
Negative:
-1 x -15578851-17 x -916403-61 x -255391-83 x -187697-181 x -86071-1037 x -15023-1411 x -11041-3077 x -5063
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 15,578,851, 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 | 15,578,851 | |
| -1 | -15,578,851 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 15,578,851.
Example:
1 x 15,578,851 = 15,578,851
and
-1 x -15,578,851 = 15,578,851
Notice both answers equal 15,578,851
With that explanation out of the way, let's continue. Next, we take the number 15,578,851 and divide it by 2:
15,578,851 ÷ 2 = 7,789,425.5
If the quotient is a whole number, then 2 and 7,789,425.5 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 | 15,578,851 | |
| -1 | -15,578,851 |
Now, we try dividing 15,578,851 by 3:
15,578,851 ÷ 3 = 5,192,950.3333
If the quotient is a whole number, then 3 and 5,192,950.3333 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 | 15,578,851 | |
| -1 | -15,578,851 |
Let's try dividing by 4:
15,578,851 ÷ 4 = 3,894,712.75
If the quotient is a whole number, then 4 and 3,894,712.75 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 | 15,578,851 | |
| -1 | 15,578,851 |
If you did it right, you will end up with this table:
| 1 | 17 | 61 | 83 | 181 | 1,037 | 1,411 | 3,077 | 5,063 | 11,041 | 15,023 | 86,071 | 187,697 | 255,391 | 916,403 | 15,578,851 |
| -1 | -17 | -61 | -83 | -181 | -1,037 | -1,411 | -3,077 | -5,063 | -11,041 | -15,023 | -86,071 | -187,697 | -255,391 | -916,403 | -15,578,851 |
Here are some more numbers to try:
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