Properties of the Number 72821

Seventy-Two Thousand Eight Hundred Twenty-One

Basics

Value: 72820 → 72821 → 72822

Parity: odd

Prime: No

Previous Prime: 72817

Next Prime: 72823

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 7 × 101 × 103

Divisors: 1, 7, 101, 103, 707, 721, 10403, 72821

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001110001110101

Octal: 216165

Duodecimal: 36185

Hexadecimal: 11c75

Square: 5302898041

Square Root: 269.85366404775755

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 ways tiling a 2 X n rectangle with 2 X 1 (domino) and 3 X 1 (tromino) tiles. A129682

Structured rhombic triacontahedral numbers (vertex structure 11). A100164

Numbers k such that R_k + 8 is prime, where R_k = 11...1 is the repunit (A002275) of length k. A97685

Largest prime that can appear in any representation of n as an arithmetic mean of distinct primes. A72821