A:
Positive:
1 x 721587113 x 55506717 x 424463103 x 70057221 x 32651317 x 227631339 x 53891751 x 4121
Negative:
-1 x -7215871-13 x -555067-17 x -424463-103 x -70057-221 x -32651-317 x -22763-1339 x -5389-1751 x -4121
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 7,215,871, 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 | 7,215,871 | |
| -1 | -7,215,871 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 7,215,871.
Example:
1 x 7,215,871 = 7,215,871
and
-1 x -7,215,871 = 7,215,871
Notice both answers equal 7,215,871
With that explanation out of the way, let's continue. Next, we take the number 7,215,871 and divide it by 2:
7,215,871 ÷ 2 = 3,607,935.5
If the quotient is a whole number, then 2 and 3,607,935.5 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 | 7,215,871 | |
| -1 | -7,215,871 |
Now, we try dividing 7,215,871 by 3:
7,215,871 ÷ 3 = 2,405,290.3333
If the quotient is a whole number, then 3 and 2,405,290.3333 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 | 7,215,871 | |
| -1 | -7,215,871 |
Let's try dividing by 4:
7,215,871 ÷ 4 = 1,803,967.75
If the quotient is a whole number, then 4 and 1,803,967.75 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 | 7,215,871 | |
| -1 | 7,215,871 |
If you did it right, you will end up with this table:
| 1 | 13 | 17 | 103 | 221 | 317 | 1,339 | 1,751 | 4,121 | 5,389 | 22,763 | 32,651 | 70,057 | 424,463 | 555,067 | 7,215,871 |
| -1 | -13 | -17 | -103 | -221 | -317 | -1,339 | -1,751 | -4,121 | -5,389 | -22,763 | -32,651 | -70,057 | -424,463 | -555,067 | -7,215,871 |
Here are some more numbers to try:
Try the factor calculator