A:
Positive:
1 x 2166206355 x 433241277 x 3094580511 x 1969278535 x 618916155 x 393855777 x 2813255385 x 562651
Negative:
-1 x -216620635-5 x -43324127-7 x -30945805-11 x -19692785-35 x -6189161-55 x -3938557-77 x -2813255-385 x -562651
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 216,620,635, 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 | 216,620,635 | |
| -1 | -216,620,635 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 216,620,635.
Example:
1 x 216,620,635 = 216,620,635
and
-1 x -216,620,635 = 216,620,635
Notice both answers equal 216,620,635
With that explanation out of the way, let's continue. Next, we take the number 216,620,635 and divide it by 2:
216,620,635 ÷ 2 = 108,310,317.5
If the quotient is a whole number, then 2 and 108,310,317.5 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 | 216,620,635 | |
| -1 | -216,620,635 |
Now, we try dividing 216,620,635 by 3:
216,620,635 ÷ 3 = 72,206,878.3333
If the quotient is a whole number, then 3 and 72,206,878.3333 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 | 216,620,635 | |
| -1 | -216,620,635 |
Let's try dividing by 4:
216,620,635 ÷ 4 = 54,155,158.75
If the quotient is a whole number, then 4 and 54,155,158.75 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 | 216,620,635 | |
| -1 | 216,620,635 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 11 | 35 | 55 | 77 | 385 | 562,651 | 2,813,255 | 3,938,557 | 6,189,161 | 19,692,785 | 30,945,805 | 43,324,127 | 216,620,635 |
| -1 | -5 | -7 | -11 | -35 | -55 | -77 | -385 | -562,651 | -2,813,255 | -3,938,557 | -6,189,161 | -19,692,785 | -30,945,805 | -43,324,127 | -216,620,635 |
Here are some more numbers to try:
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