Properties of the Number 2660

Two Thousand Six Hundred Sixty

Basics

Value: 2659 → 2660 → 2661

Parity: even

Prime: No

Previous Prime: 2659

Next Prime: 2663

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5 × 7 × 19

Divisors: 1, 2, 4, 5, 7, 10, 14, 19, 20, 28

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100100

Octal: 5144

Duodecimal: 1658

Hexadecimal: a64

Square: 7075600

Square Root: 51.57518783291051

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) = binomial(n+3, 3)/4 for odd n, n*(n+2)*(n+4)/24 for even n. A6918

a(n) = 2·binomial(n,3). A7290

Triangle read by rows, the Bell transform of the triple factorial numbers A007559(n+1) without column 0. A35469

a(n) = floor(n*φ⁹), where φ is the golden ratio, A001622. A4924

a(n) = 2·n*(n+3). A139570

a(n) = n*(3·n + 13)/2. A140672

a(1) = 0, a(2) = 1, and for n > 2, a(n) = 2·a(A252463(n)) + [n == 1 (mod 4)]. A292385

5 times pentagonal numbers: 5·n*(3·n-1)/2. A152734

Number of integer partitions of n with no part dividing or divisible by all the others. A343342

Numbers k such that lcm(1,2,3,...,k)/5 equals the denominator of the k-th harmonic number H(k). A112814