Properties of the Number 28840

Twenty-Eight Thousand Eight Hundred Forty

Basics

Value: 28839 → 28840 → 28841

Parity: even

Prime: No

Previous Prime: 28837

Next Prime: 28843

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 ³ × 5 × 7 × 103

Divisors: 1, 2, 4, 5, 7, 8, 10, 14, 20, 28

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111000010101000

Octal: 70250

Duodecimal: 14834

Hexadecimal: 70a8

Square: 831745600

Square Root: 169.82343772283025

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

T(n,k)=Number of (n+1)X(k+1) 0..4 arrays with 2X2 edge jumps all no more than +1 in one of the clockwise or counterclockwise directions but not both. A234777

Position of 5ⁿ in A051037 (5-smooth numbers). A188427

8 times octagonal numbers: 8·n*(3·n-2). A153808

Number of (n+1)X(2+1) 0..4 arrays with 2X2 edge jumps all no more than +1 in one of the clockwise or counterclockwise directions but not both. A234771

Number of (n+1)X(3+1) 0..4 arrays with 2X2 edge jumps all no more than +1 in one of the clockwise or counterclockwise directions but not both. A234772

Numbers n such that 39ⁿ + 2 is prime. A247959

a(n) = A008412(n-1) + A008412(n-2) for n>1, a(0)=0, a(1)=1. A287324

G.f. A(x) satisfies: A(x²*B(x)) = x³ - x⁴, where A(B(x)) = x. A273203

Numbers k such that sum of digits of k is a Fibonacci number. A28840

Number of 6-cycles in the n X n black bishop graph. A289160