Properties of the Number 28391

Twenty-Eight Thousand Three Hundred Ninety-One

Basics

Value: 28390 → 28391 → 28392

Parity: odd

Prime: No

Previous Prime: 28387

Next Prime: 28393

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 11 × 29 × 89

Divisors: 1, 11, 29, 89, 319, 979, 2581, 28391

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110111011100111

Octal: 67347

Duodecimal: 1451B

Hexadecimal: 6ee7

Square: 806048881

Square Root: 168.49629076036067

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 numbers E = a(n) of two non-consecutive numbers (E, F) different from (C, D) = (A352222(n), A352223(n)), such that the sums of their cubes are equal to centered cube numbers and to at least one other sum of two cubes, i.e. A = B³ + (B+1)³ = C³ + D³ = E³ + F³. A352224

Composite squarefree numbers n such that p(i)-9 divides n+9, where p(i) are the prime factors of n. A225709

The maximal norm of an additively indecomposable element in Shanks' simplest cubic field Q[x]/(x³ - n·x² - (n+3)*x - 1). A387575

a(n) = 42·n² - 1. A158626

Numbers n such that n¹⁰+10 is prime. A239347

a(n) = 15·n*(n+1) + 11. A132208

a(n) = n - floor(sqrt(n)). A28391

Number of ways to place 5 nonattacking amazons (superqueens) on an n X n board. A178967