Properties of the Number 64664

Sixty-Four Thousand Six Hundred Sixty-Four

Basics

Value: 64663 → 64664 → 64665

Parity: even

Prime: No

Previous Prime: 64663

Next Prime: 64667

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ³ × 59 × 137

Divisors: 1, 2, 4, 8, 59, 118, 137, 236, 274, 472

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1111110010011000

Octal: 176230

Duodecimal: 31508

Hexadecimal: fc98

Square: 4181432896

Square Root: 254.2911716910361

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

5-almost primes with semiprime digits (digits 4, 6, 9 only). A111697

a(n) = ∑_{1 <= x, y <= n} lcm(x, y). A64951

a(n) = floor(binomial(n,10)/10). A11856

a(n) = floor(n!*(3·floor(n/2)!*ceiling(n/2)! + 3·floor((n+2)/2)!*ceiling((n-2)/2)! - 6·floor(n/2)!*ceiling((n-2)/2)!)^-1). A366109

Number of binary arrays of length n+13 with fewer than 7 ones in any length 14 subsequence (=less than 50% duty cycle). A213117

Number of binary arrays of length 2·n+4 with fewer than n ones in any length 2n subsequence (=less than 50% duty cycle). A213122

Number of length n+3 0..2 arrays with at most one downstep in every n consecutive neighbor pairs. A255110

Regard A064413 as giving a permutation of the positive integers; sequence gives inverse permutation. A64664

T(n,k)=Number of binary arrays of length n+2·k-1 with fewer than k ones in any length 2k subsequence (=less than 50% duty cycle). A213118