Properties of the Number 28808

Twenty-Eight Thousand Eight Hundred Eight

Basics

Value: 28807 → 28808 → 28809

Parity: even

Prime: No

Previous Prime: 28807

Next Prime: 28813

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ³ × 13 × 277

Divisors: 1, 2, 4, 8, 13, 26, 52, 104, 277, 554

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111000010001000

Octal: 70210

Duodecimal: 14808

Hexadecimal: 7088

Square: 829900864

Square Root: 169.72919607421701

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 inequivalent ways (mod D₄) a pair of checkers can be placed on an n X n board. A14409

Smaller of Smith brothers. A50219

Number A(n,k) of Dyck paths having exactly k peaks in each of the levels 1,...,n and no other peaks; square array A(n,k), n>=0, k>=0, read by antidiagonals. A288972

Number of Dyck paths having exactly one peak in each of the levels 1,...,n and no other peaks. A289020

Number of (s(0), s(1), ..., s(n)) such that every s(i) is a nonnegative integer, s(0) = 2, |s(1) - s(0)| = 1, |s(i) - s(i-1)| <= 1 for i >= 2. Also sum of numbers in row n+1 of the array T in A026148. A26165

a(n) = number of ways to dispose two pawns on a chessboard of size n X n (two dispositions are equivalent if one can be rotated or reflected to give the other one). A141582

Number of ways to place 5 nonattacking bishops on an n X n board. A172129

Array read by antidiagonals: T(m,n) = number of minimal dominating sets in the rook graph K_m X K_n. A290632

Nonsquares mod 95. A28808