Properties of the Number 28639

Twenty-Eight Thousand Six Hundred Thirty-Nine

Basics

Value: 28638 → 28639 → 28640

Parity: odd

Prime: No

Previous Prime: 28631

Next Prime: 28643

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 13 × 2203

Divisors: 1, 13, 2203, 28639

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110111111011111

Octal: 67737

Duodecimal: 146A7

Hexadecimal: 6fdf

Square: 820192321

Square Root: 169.23061188803874

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 non-equivalent binary n X n matrices with two nonadjacent 1's. A232567

Denominators of the convergents of the continued fraction expansion of -ζ(1/2)/sqrt(2*π). A134472

Values of w(k) when w(k-2), w(k-1), and w(k) are all odd, where w is A336957. A338071

Pisot sequence P(7,11), a(0)=7, a(1)=11, a(n+1) is the nearest integer to a(n)²/a(n-1). Agrees with A021014 only for n <= 20. A21013

a(n)=a(n-1)+a(n-2)-a(n-4)+a(n-5). A21014

Dimension of invariant subspace of Lie polynomials of degree 2n under action of SL₂(C) on free Lie algebra of rank 2. A28351

Expansion of (theta₃(z)*theta₃(18z)+theta₂(z)*theta₂(18z))³. A28639