A:
Positive:
1 x 6426822355 x 12853644713 x 4943709531 x 2073168565 x 9887419155 x 4146337403 x 15947452015 x 318949
Negative:
-1 x -642682235-5 x -128536447-13 x -49437095-31 x -20731685-65 x -9887419-155 x -4146337-403 x -1594745-2015 x -318949
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 642,682,235, 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 | 642,682,235 | |
| -1 | -642,682,235 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 642,682,235.
Example:
1 x 642,682,235 = 642,682,235
and
-1 x -642,682,235 = 642,682,235
Notice both answers equal 642,682,235
With that explanation out of the way, let's continue. Next, we take the number 642,682,235 and divide it by 2:
642,682,235 ÷ 2 = 321,341,117.5
If the quotient is a whole number, then 2 and 321,341,117.5 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 | 642,682,235 | |
| -1 | -642,682,235 |
Now, we try dividing 642,682,235 by 3:
642,682,235 ÷ 3 = 214,227,411.6667
If the quotient is a whole number, then 3 and 214,227,411.6667 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 | 642,682,235 | |
| -1 | -642,682,235 |
Let's try dividing by 4:
642,682,235 ÷ 4 = 160,670,558.75
If the quotient is a whole number, then 4 and 160,670,558.75 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 | 642,682,235 | |
| -1 | 642,682,235 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 31 | 65 | 155 | 403 | 2,015 | 318,949 | 1,594,745 | 4,146,337 | 9,887,419 | 20,731,685 | 49,437,095 | 128,536,447 | 642,682,235 |
| -1 | -5 | -13 | -31 | -65 | -155 | -403 | -2,015 | -318,949 | -1,594,745 | -4,146,337 | -9,887,419 | -20,731,685 | -49,437,095 | -128,536,447 | -642,682,235 |
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