Calculators

Math

Factors

27 is a perfect cube (3³) equal to 3 × 3 × 3. Interestingly, it equals three times the sum of its digits (2 + 7 = 9, 3×9 = 27) and has 4 factors.

All Factors

The factors of 27 are:  1, 3, 9, 27

The prime factorization is: 27 = 3 x 3 x 3

Factoring of 27 Using Trial Division

Find the Factors of 27 :

• Calculate the square root of 27 which is 5.1962, and round it down to the closest whole number, 5, and use it in the next step.
• Test the integer values 1 through 5 for division into 27 where the remainder equals 0.
• We find 4 factors where the remainder of division is 0 and they are: 1, 3, 9, 27.

Factor Pairs

1 × 27 = 27
3 × 9 = 27

The factor pairs (multiples) that equal 27 when multiplied together are: (1 and 27), (3 and 9), which we found by matching up all factors of 27 which are: 1, 3, 9, 27.

Is 27 Prime or Composite?

27 is a composite number. Since it has more than two factors, we know that 27 is not prime, it is composite. Prime numbers only have two factors. They are evenly divisible by only 1 and itself.