Properties of the Number 664

Six Hundred Sixty-Four

Basics

Value: 663 → 664 → 665

Parity: even

Prime: No

Previous Prime: 661

Next Prime: 673

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ³ × 83

Divisors: 1, 2, 4, 8, 83, 166, 332, 664

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 1010011000

Octal: 1230

Duodecimal: 474

Hexadecimal: 298

Square: 440896

Square Root: 25.768197453450252

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

Number of knapsack partitions of n. A108917

a(n) = binomial(n+1, 2) + n - 1 = n*(n+3)/2 - 1. A34856

Numbers k such that k divides 1 plus the sum of the first k primes. A128165

Generalized heptagonal numbers: m*(5·m - 3)/2, m = 0, +-1, +-2 +-3, ... A85787

Numbers k such that the k-th composition in standard order is a permutation (of an initial interval). A333218

Number of partitions of n with nonnegative crank. A64428

Number of reduced words of length n in the Weyl group D₈. A162211

Product of the cube of a prime (A030078) and a different prime. A65036

Numbers k such that k⁸ + 1 is prime. A6314

a(n) = 4·n² - 9·n + 6. A54556