74 (number)
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74 (seventy-four) is the natural number following 73 and preceding 75.
In mathematics
74 is:
- the twenty-first distinct semiprime[1] and the eleventh of the form (2.q), where q is a higher prime.
- with an aliquot sum of 40, within an aliquot sequence of three composite numbers (74, 40, 50, 43, 1,0) to the Prime in the 43-aliquot tree.
- a palindromic number in bases 6 (2026) and 36 (2236).
- a nontotient.[2]
- the number of collections of subsets of {1, 2, 3} that are closed under union and intersection.[3]
- φ(74) = φ(σ(74)).[4]
There are 74 different non-Hamiltonian polyhedra with a minimum number of vertices.[5]
References
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