Properties of the Number 6688

Six Thousand Six Hundred Eighty-Eight

Basics

Value: 6687 → 6688 → 6689

Parity: even

Prime: No

Previous Prime: 6679

Next Prime: 6689

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 ⁵ × 11 × 19

Divisors: 1, 2, 4, 8, 11, 16, 19, 22, 32, 38

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101000100000

Octal: 15040

Duodecimal: 3A54

Hexadecimal: 1a20

Square: 44729344

Square Root: 81.78019320104349

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) = 2*(a(n-1) + a(n-2)), a(0) = 0, a(1) = 1. A2605

Fifth subdiagonal in array of n-gonal numbers A081422. A81436

Longest edge a of smallest (measured by the longest edge) primitive Euler bricks (a, b, c, sqrt(a² + b²), sqrt(b² + c²), sqrt(a² + c²) are integers). A31173

Convolution triangle of A002605(n) (generalized (2,2)-Fibonacci), n>=0. A73387

Numbers whose sum of prime factors is equal to their product of prime indices. A331384

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no element equal to all horizontal neighbors or unequal to all vertical neighbors, and new values 0..2 introduced in row major order. A239537

a(n) = Frobenius number for 5 successive primes = F[p(n), p(n+1), p(n+2), p(n+3), p(n+4)]. A138991

Products of the 5th power of a prime and 2 distinct primes (p⁵*q·r). A179667

Numbers n such that there are equal numbers of 0's and 1's in first n digits of binary representation of π. A39624

a(n) = 14·n² - 4·n. A195023