Properties of the Number 81768

Eighty-One Thousand Seven Hundred Sixty-Eight

Basics

Value: 81767 → 81768 → 81769

Parity: even

Prime: No

Previous Prime: 81761

Next Prime: 81769

Digit Sum: 30

Digital Root: 3

Palindrome: No

Factorization: 2 ³ × 3 × 3407

Divisors: 1, 2, 3, 4, 6, 8, 12, 24, 3407, 6814

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111101101000

Octal: 237550

Duodecimal: 3B3A0

Hexadecimal: 13f68

Square: 6686005824

Square Root: 285.9510447611619

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

Numbers k such that k + sopfr(k) is a cube. A389862

a(n) = T(2n,n-1), where T is the array in A026148. A26160

Triangle read by rows: T(n,k) = number of Ringel ladders of order n and genus k. A298800

Expansion of e.g.f. ∑_k>0 x^k / ((k-1)! - x^k). A358594

Number of k, 1<=k<=n, such that C(n,k) divides C(2n,2k). A81768