A:
Positive:
1 x 686406497 x 980580711 x 624005977 x 891437751 x 913991187 x 578275257 x 130578261 x 8309
Negative:
-1 x -68640649-7 x -9805807-11 x -6240059-77 x -891437-751 x -91399-1187 x -57827-5257 x -13057-8261 x -8309
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 68,640,649, 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 | 68,640,649 | |
| -1 | -68,640,649 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 68,640,649.
Example:
1 x 68,640,649 = 68,640,649
and
-1 x -68,640,649 = 68,640,649
Notice both answers equal 68,640,649
With that explanation out of the way, let's continue. Next, we take the number 68,640,649 and divide it by 2:
68,640,649 ÷ 2 = 34,320,324.5
If the quotient is a whole number, then 2 and 34,320,324.5 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 | 68,640,649 | |
| -1 | -68,640,649 |
Now, we try dividing 68,640,649 by 3:
68,640,649 ÷ 3 = 22,880,216.3333
If the quotient is a whole number, then 3 and 22,880,216.3333 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 | 68,640,649 | |
| -1 | -68,640,649 |
Let's try dividing by 4:
68,640,649 ÷ 4 = 17,160,162.25
If the quotient is a whole number, then 4 and 17,160,162.25 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 | 68,640,649 | |
| -1 | 68,640,649 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 77 | 751 | 1,187 | 5,257 | 8,261 | 8,309 | 13,057 | 57,827 | 91,399 | 891,437 | 6,240,059 | 9,805,807 | 68,640,649 |
| -1 | -7 | -11 | -77 | -751 | -1,187 | -5,257 | -8,261 | -8,309 | -13,057 | -57,827 | -91,399 | -891,437 | -6,240,059 | -9,805,807 | -68,640,649 |
Here are some more numbers to try:
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