Properties of the Number 64665

Sixty-Four Thousand Six Hundred Sixty-Five

Basics

Value: 64664 → 64665 → 64666

Parity: odd

Prime: No

Previous Prime: 64663

Next Prime: 64667

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 5 × 479

Divisors: 1, 3, 5, 9, 15, 27, 45, 135, 479, 1437

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1111110010011001

Octal: 176231

Duodecimal: 31509

Hexadecimal: fc99

Square: 4181562225

Square Root: 254.2931379333701

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

Numbers k such that k and k+1 have same sum of divisors. A2961

Numbers k such that bsigma(k) = bsigma(k+1), where bsigma(k) is the sum of the bi-unitary divisors of k (A188999). A293183

Numbers k such that isigma(k) = isigma(k+1), where isigma(k) is the sum of the infinitary divisors of k (A049417). A306985

Numbers k such that k and k+1 have the same number and sum of divisors. A54004

Numbers k such that the average of the divisors of k and k+1 is the same. A238380

The Wiener index of the meta-polyphenyl chain with n hexagons (see the Dou et al. and the Deng references). A216110

Numbers n such that σ(n+1) - σ(n) = k·n for some integer k, where σ(n) = A000203 (sum of divisors of n). A223136

Table of consecutive numbers with the same sum of divisors. A225757

Runs of consecutive numbers with the same number and sum of divisors. A225758

Numbers n such that floor(antisigma(n) / σ(n)) = floor(antisigma(n+1) / σ(n+1)). A244666