Properties of the Number 8660

Eight Thousand Six Hundred Sixty

Basics

Value: 8659 → 8660 → 8661

Parity: even

Prime: No

Previous Prime: 8647

Next Prime: 8663

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5 × 433

Divisors: 1, 2, 4, 5, 10, 20, 433, 866, 1732, 2165

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10000111010100

Octal: 20724

Duodecimal: 5018

Hexadecimal: 21d4

Square: 74995600

Square Root: 93.05912099305473

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

a(n) = n·a(n-1) + 1, a(0) = 0. A2627

Number of unlabeled series-parallel posets (i.e., generated by unions and sums) with n nodes. A3430

Numbers k such that 3^k + 20 is prime. A219040

Number of compositions of n with all adjacent parts (x,y) satisfying x < 2y and y < 2x. A342330

T(n,k)=Number of nXk 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero. A231246

Numbers k > 1 such that, in base 4, k and k² contain the same digits in the same proportion. A61658

a(n) = (11·n² - 7·n)/2. A180223

T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001001. A260294

Each term in the table is the product of the two terms above it + 1. A59922

Number of (-1,0,1) polynomials of degree-n irreducible over the integers. A87610