Properties of the Number 66840

Sixty-Six Thousand Eight Hundred Forty

Basics

Value: 66839 → 66840 → 66841

Parity: even

Prime: No

Previous Prime: 66821

Next Prime: 66841

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 ³ × 3 × 5 × 557

Divisors: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000010100011000

Octal: 202430

Duodecimal: 32820

Hexadecimal: 10518

Square: 4467585600

Square Root: 258.534330408942

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

Let S denote the palindromes in the language {0,1}*; a(n) = number of words of length n in the language SS. A7055

Expansion of ∑_k>=2 x^Fibonacci(k)/(1 - x^Fibonacci(k)) / ∏_k>=2 (1 - x^Fibonacci(k)). A281689

Sum of positive integers k where k <= n/2 and gcd(k,n) = 1. A66840

Least positive number with exactly n partitions into a square and a cube. A122054