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# What are the and prime factors of 28?

Updated: 12/12/2022

Wiki User

12y ago

28 is a composite number because it has factors other than 1 and itself. It is not a Prime number.

The 6 factors of 28 are 1, 2, 4, 7, 14, and 28.

1 + 2 + 4 + 7 + 14,

The factor pairs of 28 are 1 x 28, 2 x 14, and 4 x 7.

The proper factors of 28 are 1, 2, 4, 7, and 14 or,

if the definition you are using excludes 1, they are 2, 4, 7, and 14.

The prime factors of 28 is 2 and 7.

Note: There is repetition of these factors, so if the prime factors are being listed instead of the prime factorization, usually only the distinct prime factors are listed.

Prime numbers mean only 1 and it self are its factors.

The distinct prime factors (listing each prime factor only once) of 28 are 2 and 7.

The prime factorization of 28 is 2 x 2 x 7 or, in index form (in other words, using exponents), 22 x 7.

NOTE: 28 is also a perfect number because the sum of its proper factors (the definition including 1) equals itself: 1 + 2 + 4 + 7 + 14 = 28.

NOTE: There cannot be common factors, a greatest common factor, or a least common multiple because "common" refers to factors or multiples that two or more numbers have in common.

Wiki User

8y ago

Wiki User

12y ago

To find the prime factors of a number, it is easiest to divide that number by any obvious factors. In this case, 28 is even so we can divide by 2 to give 14. 14 is also even, so we can divide by 2 again to give 7. 7 is prime, so we have finished prime factorising 28. Thus, the prime factors of 28 are 2, 2 and 7.

Wiki User

9y ago

1, 2, 4, 7, 14, 28

2 and 7 are prime.

Jaikaram Nijjar

Lvl 2
3y ago

what are the prime factors of 28 smallest to largest

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