A:
Positive:
1 x 7235602141 x 176478179 x 91589989 x 812989251 x 2882713239 x 223393649 x 198297031 x 10291
Negative:
-1 x -72356021-41 x -1764781-79 x -915899-89 x -812989-251 x -288271-3239 x -22339-3649 x -19829-7031 x -10291
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 72,356,021, 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 | 72,356,021 | |
| -1 | -72,356,021 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 72,356,021.
Example:
1 x 72,356,021 = 72,356,021
and
-1 x -72,356,021 = 72,356,021
Notice both answers equal 72,356,021
With that explanation out of the way, let's continue. Next, we take the number 72,356,021 and divide it by 2:
72,356,021 ÷ 2 = 36,178,010.5
If the quotient is a whole number, then 2 and 36,178,010.5 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 | 72,356,021 | |
| -1 | -72,356,021 |
Now, we try dividing 72,356,021 by 3:
72,356,021 ÷ 3 = 24,118,673.6667
If the quotient is a whole number, then 3 and 24,118,673.6667 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 | 72,356,021 | |
| -1 | -72,356,021 |
Let's try dividing by 4:
72,356,021 ÷ 4 = 18,089,005.25
If the quotient is a whole number, then 4 and 18,089,005.25 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 | 72,356,021 | |
| -1 | 72,356,021 |
If you did it right, you will end up with this table:
| 1 | 41 | 79 | 89 | 251 | 3,239 | 3,649 | 7,031 | 10,291 | 19,829 | 22,339 | 288,271 | 812,989 | 915,899 | 1,764,781 | 72,356,021 |
| -1 | -41 | -79 | -89 | -251 | -3,239 | -3,649 | -7,031 | -10,291 | -19,829 | -22,339 | -288,271 | -812,989 | -915,899 | -1,764,781 | -72,356,021 |
Here are some more numbers to try:
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