Properties of the Number 28660

Twenty-Eight Thousand Six Hundred Sixty

Basics

Value: 28659 → 28660 → 28661

Parity: even

Prime: No

Previous Prime: 28657

Next Prime: 28661

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 ² × 5 × 1433

Divisors: 1, 2, 4, 5, 10, 20, 1433, 2866, 5732, 7165

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110111111110100

Octal: 67764

Duodecimal: 14704

Hexadecimal: 6ff4

Square: 821395600

Square Root: 169.29264603047588

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

Expansion of ∏_k>=1 (1 + x^2·k-1)^2·k-1. A262736

Expansion of ∏_k>=1 (1 - x^2·k-1)^2·k-1. A285069

a(n) = Fibonacci(n) + 3. A157726

Numbers m such that m + σ(m) is a repdigit. A116017

Irregular array where the n-th row are the divisors, not occurring earlier in the sequence, of the sum of the terms in all previous rows. a(1)=5. A120579

Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w³<x³+y³. A211801

a(n) = a(n-1) + Fibonacci(n), a(1)=5. A169622

Number of strictly increasing arrangements of n nonzero numbers in -(n+3)..(n+3) with sum zero. A188118

Smallest nonsquarefree integer > the n-th term of the Fibonacci sequence. A114555

Table read by downward antidiagonals: T(n,k) is the number of strictly increasing arrangements of n nonzero numbers in -(n+k-2)..(n+k-2) with sum zero. A188122