Properties of the Number 28001

Twenty-Eight Thousand One

Basics

Value: 28000 → 28001 → 28002

Parity: odd

Prime: Yes

Previous Prime: 27997

Next Prime: 28019

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 28001

Divisors: 1, 28001

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 110110101100001

Octal: 66541

Duodecimal: 14255

Hexadecimal: 6d61

Square: 784056001

Square Root: 167.3349933516597

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 L(2·k + 1) is prime, where L(m) is a Lucas number. A117522

Primes of form n² + 2401. A256835

A239461(n) / n². A239464

Numbers at the start of a run of exactly 2 consecutive primes that are Sophie Germain primes. A339475

Primes which are the sum of three distinct positive cubes in two or more distinct ways. A180088

Number of unlabeled rooted trees with n nodes where the outdegrees (branching factors) of at least one pair of adjacent nodes differ by at least two and the outdegrees of at least one pair of adjacent nodes are equal. A253244

Hyperartiads. A270798

G.f.: ∑_n>=0 (n+1)*(n+2)/2 * (x + xⁿ)ⁿ. A325998

Primes p such that x⁴⁸ = 2 has no solution mod p, but x²⁴ = 2 has a solution mod p. A59669

a(1) = 1, a(n) = least prime divisor of b(n), where b(1) = 1, b(n) = n·b(n-1) + 1 = A002627(n). A96057