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74 (number) 
Summary
74 (seventy-four) is the natural number following 73 and preceding 75
| ||||
|---|---|---|---|---|
| Cardinal | seventy-four | |||
| Ordinal | 74th (seventy-fourth) | |||
| Factorization | 2 × 37 | |||
| Divisors | 1, 2, 37, 74 | |||
| Greek numeral | ΟΔ´ | |||
| Roman numeral | LXXIV, lxxiv | |||
| Binary | 10010102 | |||
| Ternary | 22023 | |||
| Senary | 2026 | |||
| Octal | 1128 | |||
| Duodecimal | 6212 | |||
| Hexadecimal | 4A16 | |||
In mathematics
edit74 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
edit- ^ Sloane, N. J. A. (ed.). "Sequence A001358". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ "Sloane's A005277 : Nontotients". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
- ^ Sloane, N. J. A. (ed.). "Sequence A306445 (Number of collections of subsets of {1, 2, ..., n} that are closed under union and intersection)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-05-22.
- ^ Sloane, N. J. A. (ed.). "Sequence A006872". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ "Sloane's A007033: Non-Hamiltonian polyhedra with n nodes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2020-12-11.