**The factors of 84 are (-1), (-2), (-3), (-4), (-6), (-7), (-12), (-14), (-21), (-28), (-42), (-84), 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42 and 84.** To find the factors of a number, mathematicians find all of the possible number combinations that can be multiplied to give the number.

Using divisibility rules can help someone quickly find the factors of a number. All of the even numbers are always divisible by 2. If the digits that make up a number can be added to make a number that can be evenly divided by 3, the number itself is divisible by 3. All numbers that end in a 0 or a 5 are always divisible by 5.