Properties of the Number 82805

Eighty-Two Thousand Eight Hundred Five

Basics

Value: 82804 → 82805 → 82806

Parity: odd

Prime: No

Previous Prime: 82799

Next Prime: 82811

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 5 × 16561

Divisors: 1, 5, 16561, 82805

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10100001101110101

Octal: 241565

Duodecimal: 3BB05

Hexadecimal: 14375

Square: 6856668025

Square Root: 287.75857936819193

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 k and k² use only the digits 0, 2, 5, 6 and 8. A136913

Numbers k = concat(s,t) such that k = (Fibonacci(s) mod k) * (Fibonacci(t) mod k). A272770

a(n) is the number of edges of a regular polygon P with the property that packing n nonoverlapping equal circles inside P, arranged in a configuration with dihedral symmetry D_2m with m >= 3, maximizes the packing density. A343262

Duplicate of A071119. A82805

a(n) is the number of edges of the regular polygon such that packing n nonoverlapping equal circles inside the regular polygon gives the highest packing density. a(n) = 0 if such a regular polygon is a circle. A342843