Properties of the Number 28681

Twenty-Eight Thousand Six Hundred Eighty-One

Basics

Value: 28680 → 28681 → 28682

Parity: odd

Prime: No

Previous Prime: 28669

Next Prime: 28687

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 23 × 29 × 43

Divisors: 1, 23, 29, 43, 667, 989, 1247, 28681

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111000000001001

Octal: 70011

Duodecimal: 14721

Hexadecimal: 7009

Square: 822599761

Square Root: 169.3546574499798

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

MM-numbers of labeled graphs with loops spanning an initial interval of positive integers. A320461

Array read by antidiagonals: T(n,k) is the number of n X k nonnegative integer matrices with all column sums n and row sums k. A333901

T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 0 1 0 vertically. A208164

Number of diagonal rectangles with corners on an n X n grid of points. A113751

Number of vertices at level n of the hyperbolic Pascal pyramid PP_4,5. A293066

Numbers n such that (nⁿ-2)/(n-2) is an integer. A242787

a(n) = (a(n-3) + a(n-1) * a(n-5)) / a(n-6), a(0) = a(1) = ... = a(5) = 1. A275173

Number of n X 3 0..3 arrays with row sums 3 and column sums n. A172743

Positions of 2 in sequence A217916. A217918

Expansion of (1-x)^-1/(1-2·x²+x³). A77880