Properties of the Number 28705

Twenty-Eight Thousand Seven Hundred Five

Basics

Value: 28704 → 28705 → 28706

Parity: odd

Prime: No

Previous Prime: 28703

Next Prime: 28711

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 5 × 5741

Divisors: 1, 5, 5741, 28705

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111000000100001

Octal: 70041

Duodecimal: 14741

Hexadecimal: 7021

Square: 823977025

Square Root: 169.42549985170473

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

Numbers k such that 2^k + 27 is prime. A157007

Number of edges in the n-Pell graph. A364553

Used by Polya in calculating A000598. A36676

Sylvester dividends for Pell numbers. A105606

Numbers n such that the decimal equivalent of the binary reflected Gray code representation of n is a palindromic prime. A281382

Pisot sequence L(3,8). A48579

a(0) = 5, a(1) = 7; for n>1, a(n) = a(n-1)+a(n-2)-(2n-2). A89061

Expansion of (theta₃(z)*theta₃(3z)*theta₃(9z)+theta₂(z)*theta₂(3z)*theta₂(9z))⁴. A28705