Properties of the Number 6816

Six Thousand Eight Hundred Sixteen

Basics

Value: 6815 → 6816 → 6817

Parity: even

Prime: No

Previous Prime: 6803

Next Prime: 6823

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ⁵ × 3 × 71

Divisors: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 1101010100000

Octal: 15240

Duodecimal: 3B40

Hexadecimal: 1aa0

Square: 46457856

Square Root: 82.55906976220118

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

Multiples of 16 containing a 16 in their decimal representation. A121036

a(n) = n*(5·n² - 2)/3. A4466

E.g.f.: exp(-2·x) / (1-x)². A87981

Number of times prime(n) occurs as the least prime factor among numbers 1 .. prime(n)³: a(n) = A078898(A030078(n)). A250474

Even octagonal numbers: a(n) = 4·n*(3·n-1). A14642

Numbers k such that φ(x) = k has exactly 11 solutions. A60674

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

a(n) = 3ⁿ + 2ⁿ - 1. A5056

a(n) = a(n-2) + a(n-3) + a(n-4) + a(n-5) + a(n-6) + a(n-7). A109538

Expansion of (φ³(q³) / φ(q)) * (ψ(-q³) / ψ³(-q)) in powers of q where φ(), ψ() are Ramanujan θ functions. A164617