Factors of 721

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What are the factors of 721?

Answer

Factors of 721:
1, 7, 103, 721

4 factors · 721 = 7 × 103 · composite

Underlined — prime: 7, 103 · 1 — neither prime nor composite · others — composite

Factor pairs of 721

√721 ≈ 26.8517103721

2 pairs: 1 × 721 · 7 × 103

Past √721 ≈ 26.85 every pair would repeat one already found — so checking stops at 26.

721 = 7 × 103 → (1 + 1) × (1 + 1) = 4 factors: add 1 to each exponent and multiply.

Related Calculations

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Factors Table

NumberFactors
7061, 2, 353, 706
7071, 7, 101, 707
7081, 2, 3, 4, 6, 12, 59, 118, 177, 236, 354, 708
7091, 709
7101, 2, 5, 10, 71, 142, 355, 710
7111, 3, 9, 79, 237, 711
7121, 2, 4, 8, 89, 178, 356, 712
7131, 23, 31, 713
7141, 2, 3, 6, 7, 14, 17, 21, 34, 42, 51, 102, 119, 238, 357, 714
7151, 5, 11, 13, 55, 65, 143, 715
7161, 2, 4, 179, 358, 716
7171, 3, 239, 717
7181, 2, 359, 718
7191, 719
7201, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 720
7211, 7, 103, 721
7221, 2, 19, 38, 361, 722
7231, 3, 241, 723
7241, 2, 4, 181, 362, 724
7251, 5, 25, 29, 145, 725
7261, 2, 3, 6, 11, 22, 33, 66, 121, 242, 363, 726
7271, 727
7281, 2, 4, 7, 8, 13, 14, 26, 28, 52, 56, 91, 104, 182, 364, 728
7291, 3, 9, 27, 81, 243, 729
7301, 2, 5, 10, 73, 146, 365, 730
7311, 17, 43, 731
7321, 2, 3, 4, 6, 12, 61, 122, 183, 244, 366, 732
7331, 733
7341, 2, 367, 734
7351, 3, 5, 7, 15, 21, 35, 49, 105, 147, 245, 735

FAQ

What are the factors of 721?

Factors of 721: 1, 7, 103, 721

How many factors does 721 have?

Number 721 has 4 factors

How many factor pairs does 721 have?

Number 721 has 2 factor pairs

Is 721 a prime or composite number?

Composite: 721 = 7 × 103, so it has 4 factors — a prime has exactly two.

How many factors does 721 have excluding 1 and 721?

2: 7 and 103.

See Also