A:
Positive:
1 x 646246255 x 1292492513 x 497112525 x 258498565 x 994225125 x 516997325 x 1988451625 x 39769
Negative:
-1 x -64624625-5 x -12924925-13 x -4971125-25 x -2584985-65 x -994225-125 x -516997-325 x -198845-1625 x -39769
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 64,624,625, 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 | 64,624,625 | |
| -1 | -64,624,625 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 64,624,625.
Example:
1 x 64,624,625 = 64,624,625
and
-1 x -64,624,625 = 64,624,625
Notice both answers equal 64,624,625
With that explanation out of the way, let's continue. Next, we take the number 64,624,625 and divide it by 2:
64,624,625 ÷ 2 = 32,312,312.5
If the quotient is a whole number, then 2 and 32,312,312.5 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 | 64,624,625 | |
| -1 | -64,624,625 |
Now, we try dividing 64,624,625 by 3:
64,624,625 ÷ 3 = 21,541,541.6667
If the quotient is a whole number, then 3 and 21,541,541.6667 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 | 64,624,625 | |
| -1 | -64,624,625 |
Let's try dividing by 4:
64,624,625 ÷ 4 = 16,156,156.25
If the quotient is a whole number, then 4 and 16,156,156.25 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 | 64,624,625 | |
| -1 | 64,624,625 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 25 | 65 | 125 | 325 | 1,625 | 39,769 | 198,845 | 516,997 | 994,225 | 2,584,985 | 4,971,125 | 12,924,925 | 64,624,625 |
| -1 | -5 | -13 | -25 | -65 | -125 | -325 | -1,625 | -39,769 | -198,845 | -516,997 | -994,225 | -2,584,985 | -4,971,125 | -12,924,925 | -64,624,625 |
Here are some more numbers to try:
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