Properties of the Number 28809

Twenty-Eight Thousand Eight Hundred Nine

Basics

Value: 28808 → 28809 → 28810

Parity: odd

Prime: No

Previous Prime: 28807

Next Prime: 28813

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 11 × 97

Divisors: 1, 3, 9, 11, 27, 33, 97, 99, 291, 297

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111000010001001

Octal: 70211

Duodecimal: 14809

Hexadecimal: 7089

Square: 829958481

Square Root: 169.73214191778763

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

Ruth-Aaron numbers (2): sum of prime divisors of n = sum of prime divisors of n+1 (both taken with multiplicity). A39752

Two-column table read by rows: Primitive distinct pairs that have the same value of φ, σ, and τ. A322688

Tricapped prism numbers. A5920

Larger of Smith brothers. A50220

9 times octagonal numbers: a(n) = 9·n*(3·n-2). A64201

Number of (w,x,y,z) with all terms in {1,...,n} and |x-y|=|y-z|. A212679

Least positive integer k such that prime(prime(k)), prime(prime(k·n)), prime(p) and prime(q) form a 4-term arithmetic progression for some pair of primes p and q. A261462

a(1) = 1; a(n+1) = -∑_d∣n d·a(d). A321384

Numbers k such that sopfr(k) = sopf(k+1), where sopf(k) = A008472(k) and sopfr(k) = A001414(k). A64675

a(n) is the number of primes between (prime(n))³ and (prime(n+1))³. A365767