A:
Positive:
1 x 2838078111 x 258007113 x 218313723 x 1233947143 x 198467253 x 112177299 x 949193289 x 8629
Negative:
-1 x -28380781-11 x -2580071-13 x -2183137-23 x -1233947-143 x -198467-253 x -112177-299 x -94919-3289 x -8629
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 28,380,781, 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 | 28,380,781 | |
| -1 | -28,380,781 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 28,380,781.
Example:
1 x 28,380,781 = 28,380,781
and
-1 x -28,380,781 = 28,380,781
Notice both answers equal 28,380,781
With that explanation out of the way, let's continue. Next, we take the number 28,380,781 and divide it by 2:
28,380,781 ÷ 2 = 14,190,390.5
If the quotient is a whole number, then 2 and 14,190,390.5 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 | 28,380,781 | |
| -1 | -28,380,781 |
Now, we try dividing 28,380,781 by 3:
28,380,781 ÷ 3 = 9,460,260.3333
If the quotient is a whole number, then 3 and 9,460,260.3333 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 | 28,380,781 | |
| -1 | -28,380,781 |
Let's try dividing by 4:
28,380,781 ÷ 4 = 7,095,195.25
If the quotient is a whole number, then 4 and 7,095,195.25 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 | 28,380,781 | |
| -1 | 28,380,781 |
If you did it right, you will end up with this table:
| 1 | 11 | 13 | 23 | 143 | 253 | 299 | 3,289 | 8,629 | 94,919 | 112,177 | 198,467 | 1,233,947 | 2,183,137 | 2,580,071 | 28,380,781 |
| -1 | -11 | -13 | -23 | -143 | -253 | -299 | -3,289 | -8,629 | -94,919 | -112,177 | -198,467 | -1,233,947 | -2,183,137 | -2,580,071 | -28,380,781 |
Here are some more numbers to try:
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