Properties of the Number 28805

Twenty-Eight Thousand Eight Hundred Five

Basics

Value: 28804 → 28805 → 28806

Parity: odd

Prime: No

Previous Prime: 28793

Next Prime: 28807

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 5 × 7 × 823

Divisors: 1, 5, 7, 35, 823, 4115, 5761, 28805

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111000010000101

Octal: 70205

Duodecimal: 14805

Hexadecimal: 7085

Square: 829728025

Square Root: 169.7203582367183

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

G.f.: A(x) = ...o x/(1-x⁴) o x/(1-x³) o x/(1-x²) o x/(1-x), composition of functions x/(1-xⁿ) for n = 1,2,3,... A136751

Sums of groups in A075639. A75640

Matrix cube of triangle A113350. A113365

Column 1 of triangle A113365, also equals column 1 of A113340⁴. A113366

Spiral sieve using Fibonacci numbers. A5626

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 0), (0, 1, 0), (1, 1, -1), (1, 1, 1)}. A150459

Triangle T(n,m) by rows: the number of tatami tilings of a 4 by n grid with 2·m monomers. A272473

Nonsquares mod 92. A28805