Factors of 28

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What are the Factors of 28?

Answer

Factors of 28:

1, 2, 4, 7, 14, 28

6 factors · 28 = 2² × 7 · composite

Underlined — prime: 2, 7 · 1 — neither prime nor composite · others — composite

Factor pairs of 28

3 pairs: 1 × 28 · 2 × 14 · 4 × 7

Past √28 ≈ 5.29 every pair would repeat one already found — so checking stops at 5.

28 = 2² × 7 → (2 + 1) × (1 + 1) = 6 factors: add 1 to each exponent and multiply.

Related Calculations

See Also

Prime Number Checker - Find out whether a given number is Prime or not
Prime Factorization - Prime Factorization Calculator
Prime Numbers List - List of all Prime Numbers - how many Prime numbers are between

Recalculate with different values ↑

Factors Table

Number	Factors
13	1, 13
14	1, 2, 7, 14
15	1, 3, 5, 15
16	1, 2, 4, 8, 16
17	1, 17
18	1, 2, 3, 6, 9, 18
19	1, 19
20	1, 2, 4, 5, 10, 20
21	1, 3, 7, 21
22	1, 2, 11, 22
23	1, 23
24	1, 2, 3, 4, 6, 8, 12, 24
25	1, 5, 25
26	1, 2, 13, 26
27	1, 3, 9, 27
28	1, 2, 4, 7, 14, 28
29	1, 29
30	1, 2, 3, 5, 6, 10, 15, 30
31	1, 31
32	1, 2, 4, 8, 16, 32
33	1, 3, 11, 33
34	1, 2, 17, 34
35	1, 5, 7, 35
36	1, 2, 3, 4, 6, 9, 12, 18, 36
37	1, 37
38	1, 2, 19, 38
39	1, 3, 13, 39
40	1, 2, 4, 5, 8, 10, 20, 40
41	1, 41
42	1, 2, 3, 6, 7, 14, 21, 42

FAQ

What are the Factors of 28?

Factors of 28: 1, 2, 4, 7, 14, 28

How many factors does 28 have?

Number 28 has 6 factors

How many Factor Pairs does 28 have?

Number 28 has 3 factor pairs

Is 28 a prime or composite number?

Composite: 28 = 2² × 7, so it has 6 factors — a prime has exactly two.

How many factors does 28 have excluding 1 and 28?

4: 2, 4, 7 and 14.