A:
Positive:
1 x 128102877 x 183004123 x 556969161 x 79567251 x 51037317 x 404111757 x 72912219 x 5773
Negative:
-1 x -12810287-7 x -1830041-23 x -556969-161 x -79567-251 x -51037-317 x -40411-1757 x -7291-2219 x -5773
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 12,810,287, 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 | 12,810,287 | |
| -1 | -12,810,287 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,810,287.
Example:
1 x 12,810,287 = 12,810,287
and
-1 x -12,810,287 = 12,810,287
Notice both answers equal 12,810,287
With that explanation out of the way, let's continue. Next, we take the number 12,810,287 and divide it by 2:
12,810,287 ÷ 2 = 6,405,143.5
If the quotient is a whole number, then 2 and 6,405,143.5 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 | 12,810,287 | |
| -1 | -12,810,287 |
Now, we try dividing 12,810,287 by 3:
12,810,287 ÷ 3 = 4,270,095.6667
If the quotient is a whole number, then 3 and 4,270,095.6667 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 | 12,810,287 | |
| -1 | -12,810,287 |
Let's try dividing by 4:
12,810,287 ÷ 4 = 3,202,571.75
If the quotient is a whole number, then 4 and 3,202,571.75 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 | 12,810,287 | |
| -1 | 12,810,287 |
If you did it right, you will end up with this table:
| 1 | 7 | 23 | 161 | 251 | 317 | 1,757 | 2,219 | 5,773 | 7,291 | 40,411 | 51,037 | 79,567 | 556,969 | 1,830,041 | 12,810,287 |
| -1 | -7 | -23 | -161 | -251 | -317 | -1,757 | -2,219 | -5,773 | -7,291 | -40,411 | -51,037 | -79,567 | -556,969 | -1,830,041 | -12,810,287 |
Here are some more numbers to try:
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