Properties of the Number 28115

Twenty-Eight Thousand One Hundred Fifteen

Basics

Value: 28114 → 28115 → 28116

Parity: odd

Prime: No

Previous Prime: 28111

Next Prime: 28123

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 5 × 5623

Divisors: 1, 5, 5623, 28115

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110110111010011

Octal: 66723

Duodecimal: 1432B

Hexadecimal: 6dd3

Square: 790453225

Square Root: 167.67528142215835

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 vertices formed by drawing the lines connecting any two of the 2*(n+2) perimeter points of a 3 X (n+1) rectangular grid of points (or equally, a 2 X n grid of squares). A331763

Expansion of (1-x²) / (1-x-3·x²+x³). A382683

a(n) is the number of distinct triangles whose sides do not pass through a grid point and whose vertices are three points of an n X n grid. A372217

Let p = n-th prime == 3 mod 8; a(n) = sum of quadratic nonresidues mod p that are < p/2. A282724

Number of nX3 0..2 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal. A207312

Expansion of 1/((1-4x)(1-5x)(1-7x)(1-8x)). A28115