74 (number)

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