Properties of the Number 68644

Sixty-Eight Thousand Six Hundred Forty-Four

Basics

Value: 68643 → 68644 → 68645

Parity: even

Prime: No

Previous Prime: 68639

Next Prime: 68659

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 131 ²

Divisors: 1, 2, 4, 131, 262, 524, 17161, 34322, 68644

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000110000100100

Octal: 206044

Duodecimal: 33884

Hexadecimal: 10c24

Square: 4711998736

Square Root: 262

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

Number of 2 X n 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically. A207025

Squares which are palindromes in base 3. A29985

a(n) = (11·n + 9)². A17498

Squares with initial digit '6'. A45789

a(n) = (9·n + 1)². A17174

Squares whose digits are all even. A30098

Corresponds to m = 7 in a family of 4th-order linear recurrence sequences given by a(m,n) = m⁴*a(n-4) + (2·m)²*a(n-3) - 4·a(m-1), a(m,0) = -1, a(m,1) = 4, a(m,2) = -13 + 6*(m-1) + 3*(m-1)², a(m,3) = (-8+m²)². A113253

Squares which can be expressed as the product of a number and its reversal. A325148

Squares of palindromes. A14186

Squares which can be expressed as the product of a number and its reverse in exactly one way. A325149