Properties of the Number 66729

Sixty-Six Thousand Seven Hundred Twenty-Nine

Basics

Value: 66728 → 66729 → 66730

Parity: odd

Prime: No

Previous Prime: 66721

Next Prime: 66733

Digit Sum: 30

Digital Root: 3

Palindrome: No

Factorization: 3 × 13 × 29 × 59

Divisors: 1, 3, 13, 29, 39, 59, 87, 177, 377, 767

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000010010101001

Octal: 202251

Duodecimal: 32749

Hexadecimal: 104a9

Square: 4452759441

Square Root: 258.31956952581044

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

a(n) = n*(2·n + 1)*(4·n + 1)/3. A258582

Odd square pyramidal numbers. A15221

Numbers n such that 5·10ⁿ + 4·R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n. A103016

Number of blocks in a Steiner Quadruple System of order A047235(n+1). A228124

a(n) = ∏_{d∣n, d<n} d if n is composite, n otherwise. A66729