Properties of the Number 27804

Twenty-Seven Thousand Eight Hundred Four

Basics

Value: 27803 → 27804 → 27805

Parity: even

Prime: No

Previous Prime: 27803

Next Prime: 27809

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 7 × 331

Divisors: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 110110010011100

Octal: 66234

Duodecimal: 14110

Hexadecimal: 6c9c

Square: 773062416

Square Root: 166.74531477675768

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) is the sum of quadratic nonresidues of A002145(n) (the n-th prime == 3 mod 4). A282036

Exponential Riordan array (e^x(1+x),x). A122832

Numbers k such that both k and k² are sums of a twin prime pair. A213784

Number of tilings of a 5 X n rectangle using n pentominoes of distinct shapes. A246902

Let p = n-th prime == 3 mod 8; a(n) = sum of quadratic nonresidues mod p . A282726

Numbers k such that k²+1, (k+2)²+1 and (k+6)²+1 are prime. A302021

G.f. A(x) satisfies: 1 = ∑_n>=0 (-x/2)ⁿ * (A(x)ⁿ + (-1)ⁿ)ⁿ. A360949

Female of (1/(n+1),n/(1+n)) pair function used to get a dual population Fibonacci. A100582

Numbers k such that 4^k - prime(k) is prime. A379694

G.f. A(x) satisfies: 1 = ∑_n>=0 (-x)ⁿ * (A(x)ⁿ + (-1)ⁿ)ⁿ. A325574