Properties of the Number 81828

Eighty-One Thousand Eight Hundred Twenty-Eight

Basics

Value: 81827 → 81828 → 81829

Parity: even

Prime: No

Previous Prime: 81817

Next Prime: 81839

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ² × 2273

Divisors: 1, 2, 3, 4, 6, 9, 12, 18, 36, 2273

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111110100100

Octal: 237644

Duodecimal: 3B430

Hexadecimal: 13fa4

Square: 6695821584

Square Root: 286.05593858544523

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 3^k - 32 is prime. A219049

Partition the concatenation 1234567...of natural numbers into successive strings which are multiples of 4, all different and > 4. (0 never taken as the most significant digit.) A77297

Partition the concatenation 1234567...of natural numbers into successive strings which are multiples of 6, all different and > 6. (0 never taken as the most significant digit.) A77299

Number of primitive (period n) n-bead necklaces with exactly four different colored beads. A56289

Number of lower triangles of a 4 X 4 0..n array with no element differing from any of its horizontal or vertical neighbors by more than one. A194933

Numbers n such that 2 successive terms of Hofstadter Q-sequence are the same. A81828