A:
Positive:
1 x 258101355 x 516202713 x 198539531 x 83258565 x 397079155 x 166517403 x 640452015 x 12809
Negative:
-1 x -25810135-5 x -5162027-13 x -1985395-31 x -832585-65 x -397079-155 x -166517-403 x -64045-2015 x -12809
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 25,810,135, 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 | 25,810,135 | |
| -1 | -25,810,135 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 25,810,135.
Example:
1 x 25,810,135 = 25,810,135
and
-1 x -25,810,135 = 25,810,135
Notice both answers equal 25,810,135
With that explanation out of the way, let's continue. Next, we take the number 25,810,135 and divide it by 2:
25,810,135 ÷ 2 = 12,905,067.5
If the quotient is a whole number, then 2 and 12,905,067.5 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 | 25,810,135 | |
| -1 | -25,810,135 |
Now, we try dividing 25,810,135 by 3:
25,810,135 ÷ 3 = 8,603,378.3333
If the quotient is a whole number, then 3 and 8,603,378.3333 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 | 25,810,135 | |
| -1 | -25,810,135 |
Let's try dividing by 4:
25,810,135 ÷ 4 = 6,452,533.75
If the quotient is a whole number, then 4 and 6,452,533.75 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 | 25,810,135 | |
| -1 | 25,810,135 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 31 | 65 | 155 | 403 | 2,015 | 12,809 | 64,045 | 166,517 | 397,079 | 832,585 | 1,985,395 | 5,162,027 | 25,810,135 |
| -1 | -5 | -13 | -31 | -65 | -155 | -403 | -2,015 | -12,809 | -64,045 | -166,517 | -397,079 | -832,585 | -1,985,395 | -5,162,027 | -25,810,135 |
Here are some more numbers to try:
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