Properties of the Number 28520

Twenty-Eight Thousand Five Hundred Twenty

Basics

Value: 28519 → 28520 → 28521

Parity: even

Prime: No

Previous Prime: 28517

Next Prime: 28537

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ³ × 5 × 23 × 31

Divisors: 1, 2, 4, 5, 8, 10, 20, 23, 31, 40

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110111101101000

Octal: 67550

Duodecimal: 14608

Hexadecimal: 6f68

Square: 813390400

Square Root: 168.8786546606764

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

Expansion of χ(q)⁵ / χ(q⁵) in powers of q where χ() is a Ramanujan θ function. A225701

Number of minimum total dominating sets in the n X n king graph. A303156

McKay-Thompson series of class 20F for Monster. A58555

Expansion of χ(-q)⁵ / χ(-q⁵) in powers of q where χ() is a Ramanujan θ function. A138521

a(1)=0, a(n) = n³ - a(n-1). A153026

Expansion of (η(q⁴) * η(q⁵) / (η(q) * η(q²⁰)))² in powers of q. A298107

a(0) = 1; thereafter a(n) = 2*(6·n² - 3·n + 1). A386477

Numbers n such that φ(4n+1) = σ(n). A67234

Number of (n+1) X (3+1) 0..2 arrays with every 2 X 2 subblock diagonal maximum minus antidiagonal minimum unequal to its neighbors horizontally, vertically, diagonally and antidiagonally. A253464

Expansion of 1/q * χ(q) * χ(q⁵) * χ(-q²⁰)² / χ(-q)² in powers of q where χ() is a Ramanujan θ function. A298116