Properties of the Number 28644

Twenty-Eight Thousand Six Hundred Forty-Four

Basics

Value: 28643 → 28644 → 28645

Parity: even

Prime: No

Previous Prime: 28643

Next Prime: 28649

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 ² × 3 × 7 × 11 × 31

Divisors: 1, 2, 3, 4, 6, 7, 11, 12, 14, 21

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 110111111100100

Octal: 67744

Duodecimal: 146B0

Hexadecimal: 6fe4

Square: 820478736

Square Root: 169.24538398432023

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

a(n) = floor(n*φ¹⁵), where φ is the golden ratio, A001622. A4930

a(n) = ∑_j=0..n ∑_k=0..j A026615(j, k). A26624

Nonnegative values·of solutions (x, y) to the Diophantine equation x² + (x + 23)² = y². A118337

a(n) = Fibonacci(n+7) - Fibonacci(7). A180672

A Jacobsthal-Pascal triangle. A124860

Integers k such that ω(k) = ω(k-1) + ω(k-2) + ω(k-3), where ω(n) is the number of distinct prime factors of n. A76252

s(k)-s(j), where the pairs (k,j) are given by A205857 and A205858, and s(k) denotes the (k+1)-st Fibonacci number. A205859

s(k)-s(j), where the pairs (k,j) are given by A205862 and A205863, and s(k) denotes the (k+1)-st Fibonacci number. A205864

Coefficients of polynomials p(n, x) generating the columns of A323224, triangle read by rows, T(n, k) for n >= 1 and k >= 0. A323233

a(n) = A051717(2n) + A051717(2n+1). A140812