Properties of the Number 28305

Twenty-Eight Thousand Three Hundred Five

Basics

Value: 28304 → 28305 → 28306

Parity: odd

Prime: No

Previous Prime: 28297

Next Prime: 28307

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 × 17 × 37

Divisors: 1, 3, 5, 9, 15, 17, 37, 45, 51, 85

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 110111010010001

Octal: 67221

Duodecimal: 14469

Hexadecimal: 6e91

Square: 801173025

Square Root: 168.24089871371942

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

Coordination sequence for (2,6,infinity) tiling of hyperbolic plane. A265070

T(n,k)=Hilltop maps: number of nXk binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..2 nXk array. A218592

Numbers m such that φ(m) = τ(m)³. A68559

Diagonal in array of n-gonal numbers A081422. A81438

Number of partitions p of n such that the multiplicity of 2·min(p) is a part. A240496

Numbers·such that the sum of all their cyclic permutations is equal to that of all cyclic permutations of σ(x) and all cyclic permutations of Euler totient function φ(x). A247317

Expansion of ∏_m>=1 (1+q^m)^-30. A22625

Numbers k such that k + σ(k) + φ(k) is a square. A116009

Elements of A065607 from primitive triples. A120693

Hilltop maps: number of n X 3 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..2 n X 3 array. A218587