Properties of the Number 68638

Sixty-Eight Thousand Six Hundred Thirty-Eight

Basics

Value: 68637 → 68638 → 68639

Parity: even

Prime: No

Previous Prime: 68633

Next Prime: 68639

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 2 × 34319

Divisors: 1, 2, 34319, 68638

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10000110000011110

Octal: 206036

Duodecimal: 3387A

Hexadecimal: 10c1e

Square: 4711175044

Square Root: 261.9885493680974

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 σ(k) = σ(k+5). A15865

Numbers whose least quadratic nonresidue (A020649) is 19. A25027

a(n) = [xⁿ] ∏_k=1..n (x^k⁴ + 1/x^k⁴). A368206

a(1) = 1, a(n) = smallest distinct composite number such that a(n) + a(k) is a composite number for all k = 1 to n. A68638