A:
Positive:
1 x 724214337 x 1034591979 x 916727173 x 418621553 x 130961757 x 956691211 x 598035299 x 13667
Negative:
-1 x -72421433-7 x -10345919-79 x -916727-173 x -418621-553 x -130961-757 x -95669-1211 x -59803-5299 x -13667
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 72,421,433, 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 | 72,421,433 | |
| -1 | -72,421,433 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 72,421,433.
Example:
1 x 72,421,433 = 72,421,433
and
-1 x -72,421,433 = 72,421,433
Notice both answers equal 72,421,433
With that explanation out of the way, let's continue. Next, we take the number 72,421,433 and divide it by 2:
72,421,433 ÷ 2 = 36,210,716.5
If the quotient is a whole number, then 2 and 36,210,716.5 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 | 72,421,433 | |
| -1 | -72,421,433 |
Now, we try dividing 72,421,433 by 3:
72,421,433 ÷ 3 = 24,140,477.6667
If the quotient is a whole number, then 3 and 24,140,477.6667 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 | 72,421,433 | |
| -1 | -72,421,433 |
Let's try dividing by 4:
72,421,433 ÷ 4 = 18,105,358.25
If the quotient is a whole number, then 4 and 18,105,358.25 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 | 72,421,433 | |
| -1 | 72,421,433 |
If you did it right, you will end up with this table:
| 1 | 7 | 79 | 173 | 553 | 757 | 1,211 | 5,299 | 13,667 | 59,803 | 95,669 | 130,961 | 418,621 | 916,727 | 10,345,919 | 72,421,433 |
| -1 | -7 | -79 | -173 | -553 | -757 | -1,211 | -5,299 | -13,667 | -59,803 | -95,669 | -130,961 | -418,621 | -916,727 | -10,345,919 | -72,421,433 |
Here are some more numbers to try:
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