Properties of the Number 64439

Sixty-Four Thousand Four Hundred Thirty-Nine

Basics

Value: 64438 → 64439 → 64440

Parity: odd

Prime: Yes

Previous Prime: 64433

Next Prime: 64451

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 64439

Divisors: 1, 64439

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111101110110111

Octal: 175667

Duodecimal: 3135B

Hexadecimal: fbb7

Square: 4152384721

Square Root: 253.8483799436191

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Irregular triangle read by rows: T(n,k) is the number of polyhedra with n faces and k vertices (n >= 4, k=4..2n-4). A212438

Triangle T(n,k) = number of polyhedra (triconnected planar graphs) with n faces and k vertices, where (n/2+2) <= k <= (2n+8). A58787

Triangle T(n,k) = number of polyhedra (triconnected planar graphs) with n edges and k vertices (or k faces), where (n/3+2) <= k <= (2n/3). Note that there is no such k when n=7. A58788

Primes of the form (p² - 3)/2 where p is also prime. A165635

Numbers k such that x^k + x⁸ + 1 is irreducible over GF(2). A57478

Number of polyhedra with n faces and n+1 vertices (or n vertices and n+1 faces). A58789

G.f.: A(x) = ∏_n>=1 1/(1 - n·A007947(n)*xⁿ)^1/n², where A007947(n) is the product of the distinct prime factors of n. A95895

Sophie Germain primes in A154939. A154941

Triangle read by rows: T(n,k) is the coefficient A_k in the transformation ∑_k=0..n x^k = ∑_k=0..n A_k*(x+2*(-1)^k)^k. A249266

Triangle read by rows: T(n,k) is the number of 3-connected planar graphs (or polyhedra) with n >= 1 nodes and 0 <= k <= C(n,2) edges. A49337