Properties of the Number 28820

Twenty-Eight Thousand Eight Hundred Twenty

Basics

Value: 28819 → 28820 → 28821

Parity: even

Prime: No

Previous Prime: 28817

Next Prime: 28837

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5 × 11 × 131

Divisors: 1, 2, 4, 5, 10, 11, 20, 22, 44, 55

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111000010010100

Octal: 70224

Duodecimal: 14818

Hexadecimal: 7094

Square: 830592400

Square Root: 169.76454282328805

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

Triangle read by rows: T(n,k) gives the number of ballot sequences of length n having k largest parts, n >= k >= 0. A238123

Expansion of (1/2)*(1-sqrt(1-8·x)/sqrt(1-4·x)). A104498

Number of ways to place 3 nonattacking wazirs on a 3 X n board. A172229

Number of ballot sequences of length n having exactly 1 largest part. A238124

Expansion of 2·x²*(x+1) / (2·x³-3·x+1). A293006

Triangular array read by rows: T(m,n) = number of Yamanouchi words of length m that start with n, m >= 1, n = 1..m. A369588

a(n) = number of solutions to the Diophantine equation x+y²+z³=n⁴ with positive x,y,z. A121876

A(n, k) is the n-th binomial transform of the Catalan sequence (A000108) evaluated at k. Array read by descending antidiagonals for n >= 0 and k >= 0. A271025

Sum of all repeated parts of all partitions of n. A163986

Squares with digits in nondecreasing order. A28820