A:
Positive:
1 x 128904555 x 257809119 x 67844547 x 27426595 x 135689235 x 54853893 x 144352887 x 4465
Negative:
-1 x -12890455-5 x -2578091-19 x -678445-47 x -274265-95 x -135689-235 x -54853-893 x -14435-2887 x -4465
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 12,890,455, 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 | 12,890,455 | |
| -1 | -12,890,455 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,890,455.
Example:
1 x 12,890,455 = 12,890,455
and
-1 x -12,890,455 = 12,890,455
Notice both answers equal 12,890,455
With that explanation out of the way, let's continue. Next, we take the number 12,890,455 and divide it by 2:
12,890,455 ÷ 2 = 6,445,227.5
If the quotient is a whole number, then 2 and 6,445,227.5 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 | 12,890,455 | |
| -1 | -12,890,455 |
Now, we try dividing 12,890,455 by 3:
12,890,455 ÷ 3 = 4,296,818.3333
If the quotient is a whole number, then 3 and 4,296,818.3333 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 | 12,890,455 | |
| -1 | -12,890,455 |
Let's try dividing by 4:
12,890,455 ÷ 4 = 3,222,613.75
If the quotient is a whole number, then 4 and 3,222,613.75 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 | 12,890,455 | |
| -1 | 12,890,455 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 47 | 95 | 235 | 893 | 2,887 | 4,465 | 14,435 | 54,853 | 135,689 | 274,265 | 678,445 | 2,578,091 | 12,890,455 |
| -1 | -5 | -19 | -47 | -95 | -235 | -893 | -2,887 | -4,465 | -14,435 | -54,853 | -135,689 | -274,265 | -678,445 | -2,578,091 | -12,890,455 |
Here are some more numbers to try:
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