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74 (number)

FieldValue
number74
divisor1, 2, 37, 74

74 (seventy-four) is the natural number following 73 and preceding 75.

In mathematics

74 is:

  • the twenty-first distinct semiprime 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.
  • the number of collections of subsets of {1, 2, 3} that are closed under union and intersection.
  • φ(74) = φ(σ(74)).

There are 74 different non-Hamiltonian polyhedra with a minimum number of vertices.

References

References

  1. {{Cite OEIS
  2. "Sloane's A005277 : Nontotients". OEIS Foundation.
  3. {{cite OEIS. A306445. Number of collections of subsets of {1, 2, ..., n} that are closed under union and intersection
  4. {{cite OEIS. A006872
  5. "Sloane's A007033: Non-Hamiltonian polyhedra with n nodes.". OEIS Foundation.
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