Properties of the Number 28085

Twenty-Eight Thousand Eighty-Five

Basics

Value: 28084 → 28085 → 28086

Parity: odd

Prime: No

Previous Prime: 28081

Next Prime: 28087

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 5 × 41 × 137

Divisors: 1, 5, 41, 137, 205, 685, 5617, 28085

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110110110110101

Octal: 66665

Duodecimal: 14305

Hexadecimal: 6db5

Square: 788767225

Square Root: 167.5857989210303

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

Pentagonal numbers with prime indices. A116995

a(n) = n-1 for n <= 4, otherwise if n is even then a(n) = a(n-5)+2^n/2, and if n is odd then a(n) = a(n-1)+2^(n-3/2). A200310

Nearest integer to 24*(2ⁿ - 1)/n. A3138

Integer part of 24(2ⁿ-1)/n. A3176

Third left hand column of triangle A163940. A163943

Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 726", based on the 5-celled von Neumann neighborhood. A283818

Consecutive states of the linear congruential pseudo-random number generator for the Texas Instruments TI99 when started at 1. A384221

Pentagonal numbers (A000326) which are also centered square numbers (A001844). A254711

Table T(n,k) = -2·T(n-1,k)+T(n-1,k+1) = T(n,k-4), 0<=n. A140287

Number of aperiodic necklaces (Lyndon words) with k<=5 black beads and n-k white beads. A277629