Factors of 90

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What are the Factors of 90?

Answer

Factors of 90:

1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90

12 factors · 90 = 2 × 3² × 5 · composite

Underlined — prime: 2, 3, 5 · 1 — neither prime nor composite · others — composite

Factor pairs of 90

6 pairs: 1 × 90 · 2 × 45 · 3 × 30 · 5 × 18 · 6 × 15 · 9 × 10

Past √90 ≈ 9.49 every pair would repeat one already found — so checking stops at 9.

90 = 2 × 3² × 5 → (1 + 1) × (2 + 1) × (1 + 1) = 12 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

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Factors Table

Number	Factors
75	1, 3, 5, 15, 25, 75
76	1, 2, 4, 19, 38, 76
77	1, 7, 11, 77
78	1, 2, 3, 6, 13, 26, 39, 78
79	1, 79
80	1, 2, 4, 5, 8, 10, 16, 20, 40, 80
81	1, 3, 9, 27, 81
82	1, 2, 41, 82
83	1, 83
84	1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
85	1, 5, 17, 85
86	1, 2, 43, 86
87	1, 3, 29, 87
88	1, 2, 4, 8, 11, 22, 44, 88
89	1, 89
90	1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
91	1, 7, 13, 91
92	1, 2, 4, 23, 46, 92
93	1, 3, 31, 93
94	1, 2, 47, 94
95	1, 5, 19, 95
96	1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96
97	1, 97
98	1, 2, 7, 14, 49, 98
99	1, 3, 9, 11, 33, 99
100	1, 2, 4, 5, 10, 20, 25, 50, 100
101	1, 101
102	1, 2, 3, 6, 17, 34, 51, 102
103	1, 103
104	1, 2, 4, 8, 13, 26, 52, 104

FAQ

What are the Factors of 90?

Factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90

How many factors does 90 have?

Number 90 has 12 factors

How many Factor Pairs does 90 have?

Number 90 has 6 factor pairs

Is 90 a prime or composite number?

Composite: 90 = 2 × 3² × 5, so it has 12 factors — a prime has exactly two.

How many factors does 90 have excluding 1 and 90?

10: 2, 3, 5, 6, 9, 10, 15, 18, 30 and 45.