Properties of the Number 28638

Twenty-Eight Thousand Six Hundred Thirty-Eight

Basics

Value: 28637 → 28638 → 28639

Parity: even

Prime: No

Previous Prime: 28631

Next Prime: 28643

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 37 × 43

Divisors: 1, 2, 3, 6, 9, 18, 37, 43, 74, 86

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110111111011110

Octal: 67736

Duodecimal: 146A6

Hexadecimal: 6fde

Square: 820135044

Square Root: 169.22765731404544

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

First differences of A014292. A104862

Expansion of ∏_k>=1 (1 - x^8*(2·k-1)) * (1 - x^8·k) / (1 - x^k). A280938

Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 382", based on the 5-celled von Neumann neighborhood. A281638

Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 403", based on the 5-celled von Neumann neighborhood. A281846

G.f.: imaginary part of 1/(1 - i·x - i·x²) where i=sqrt(-1). A201838

Expansion of 1/(1 - x + x³ - 3·x⁴ + x⁵ - x⁷ + x⁸). A147593

a(n) = A300617(n) / (n*(n+1)/2) for n>=1. A300589

O.g.f. A(x) satisfies: [xⁿ] exp( n·A(x) ) = n² * [x^n-1] exp( n·A(x) ) for n>=1. A300617

Expansion of (theta₃(z)*theta₃(18z)+theta₂(z)*theta₂(18z))². A28638