A:
Positive:
1 x 72040156111 x 6549105123 x 31321807253 x 2847437607 x 11868234691 x 1535716677 x 10789313961 x 51601
Negative:
-1 x -720401561-11 x -65491051-23 x -31321807-253 x -2847437-607 x -1186823-4691 x -153571-6677 x -107893-13961 x -51601
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 720,401,561, 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 | 720,401,561 | |
| -1 | -720,401,561 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 720,401,561.
Example:
1 x 720,401,561 = 720,401,561
and
-1 x -720,401,561 = 720,401,561
Notice both answers equal 720,401,561
With that explanation out of the way, let's continue. Next, we take the number 720,401,561 and divide it by 2:
720,401,561 ÷ 2 = 360,200,780.5
If the quotient is a whole number, then 2 and 360,200,780.5 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 | 720,401,561 | |
| -1 | -720,401,561 |
Now, we try dividing 720,401,561 by 3:
720,401,561 ÷ 3 = 240,133,853.6667
If the quotient is a whole number, then 3 and 240,133,853.6667 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 | 720,401,561 | |
| -1 | -720,401,561 |
Let's try dividing by 4:
720,401,561 ÷ 4 = 180,100,390.25
If the quotient is a whole number, then 4 and 180,100,390.25 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 | 720,401,561 | |
| -1 | 720,401,561 |
If you did it right, you will end up with this table:
| 1 | 11 | 23 | 253 | 607 | 4,691 | 6,677 | 13,961 | 51,601 | 107,893 | 153,571 | 1,186,823 | 2,847,437 | 31,321,807 | 65,491,051 | 720,401,561 |
| -1 | -11 | -23 | -253 | -607 | -4,691 | -6,677 | -13,961 | -51,601 | -107,893 | -153,571 | -1,186,823 | -2,847,437 | -31,321,807 | -65,491,051 | -720,401,561 |
Here are some more numbers to try:
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