A:
Positive:
1 x 686578155 x 1373156317 x 403869585 x 807739191 x 359465955 x 718933247 x 211454229 x 16235
Negative:
-1 x -68657815-5 x -13731563-17 x -4038695-85 x -807739-191 x -359465-955 x -71893-3247 x -21145-4229 x -16235
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 68,657,815, 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 | 68,657,815 | |
| -1 | -68,657,815 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 68,657,815.
Example:
1 x 68,657,815 = 68,657,815
and
-1 x -68,657,815 = 68,657,815
Notice both answers equal 68,657,815
With that explanation out of the way, let's continue. Next, we take the number 68,657,815 and divide it by 2:
68,657,815 ÷ 2 = 34,328,907.5
If the quotient is a whole number, then 2 and 34,328,907.5 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 | 68,657,815 | |
| -1 | -68,657,815 |
Now, we try dividing 68,657,815 by 3:
68,657,815 ÷ 3 = 22,885,938.3333
If the quotient is a whole number, then 3 and 22,885,938.3333 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 | 68,657,815 | |
| -1 | -68,657,815 |
Let's try dividing by 4:
68,657,815 ÷ 4 = 17,164,453.75
If the quotient is a whole number, then 4 and 17,164,453.75 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 | 68,657,815 | |
| -1 | 68,657,815 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 85 | 191 | 955 | 3,247 | 4,229 | 16,235 | 21,145 | 71,893 | 359,465 | 807,739 | 4,038,695 | 13,731,563 | 68,657,815 |
| -1 | -5 | -17 | -85 | -191 | -955 | -3,247 | -4,229 | -16,235 | -21,145 | -71,893 | -359,465 | -807,739 | -4,038,695 | -13,731,563 | -68,657,815 |
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