Properties of the Number 64639

Sixty-Four Thousand Six Hundred Thirty-Nine

Basics

Value: 64638 → 64639 → 64640

Parity: odd

Prime: No

Previous Prime: 64633

Next Prime: 64661

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 37 × 1747

Divisors: 1, 37, 1747, 64639

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111110001111111

Octal: 176177

Duodecimal: 314A7

Hexadecimal: fc7f

Square: 4178200321

Square Root: 254.24201069060163

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

The least number s > 1 having exactly n fives in the periodic part of the continued fraction of sqrt(s). A206585

Composite numbers k such that k-1 divides 2^k-2. A330382

Numbers n such that the digital sum of n is the same as the digital sum of n² in both base 2 and base 10. A261640

Positions of non-crossing fixed-point-free involutions encoded by A014486 (after reflection) in A055089. Permutation of A064640. A64639