A:
Positive:
1 x 1268839331 x 40930341 x 30947367 x 189379149 x 851571271 x 99832077 x 61092747 x 4619
Negative:
-1 x -12688393-31 x -409303-41 x -309473-67 x -189379-149 x -85157-1271 x -9983-2077 x -6109-2747 x -4619
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 12,688,393, 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 | 12,688,393 | |
| -1 | -12,688,393 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,688,393.
Example:
1 x 12,688,393 = 12,688,393
and
-1 x -12,688,393 = 12,688,393
Notice both answers equal 12,688,393
With that explanation out of the way, let's continue. Next, we take the number 12,688,393 and divide it by 2:
12,688,393 ÷ 2 = 6,344,196.5
If the quotient is a whole number, then 2 and 6,344,196.5 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 | 12,688,393 | |
| -1 | -12,688,393 |
Now, we try dividing 12,688,393 by 3:
12,688,393 ÷ 3 = 4,229,464.3333
If the quotient is a whole number, then 3 and 4,229,464.3333 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 | 12,688,393 | |
| -1 | -12,688,393 |
Let's try dividing by 4:
12,688,393 ÷ 4 = 3,172,098.25
If the quotient is a whole number, then 4 and 3,172,098.25 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 | 12,688,393 | |
| -1 | 12,688,393 |
If you did it right, you will end up with this table:
| 1 | 31 | 41 | 67 | 149 | 1,271 | 2,077 | 2,747 | 4,619 | 6,109 | 9,983 | 85,157 | 189,379 | 309,473 | 409,303 | 12,688,393 |
| -1 | -31 | -41 | -67 | -149 | -1,271 | -2,077 | -2,747 | -4,619 | -6,109 | -9,983 | -85,157 | -189,379 | -309,473 | -409,303 | -12,688,393 |
Here are some more numbers to try:
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