Properties of the Number 82780

Eighty-Two Thousand Seven Hundred Eighty

Basics

Value: 82779 → 82780 → 82781

Parity: even

Prime: No

Previous Prime: 82763

Next Prime: 82781

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 5 × 4139

Divisors: 1, 2, 4, 5, 10, 20, 4139, 8278, 16556, 20695

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10100001101011100

Octal: 241534

Duodecimal: 3BAA4

Hexadecimal: 1435c

Square: 6852528400

Square Root: 287.71513689759183

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 2·3^k + 1 is prime. A3306

Number of ways to place 3 nonattacking knights on a 3 X n board. A172212

Numbers n such that 2·3ⁿ + 1 is a primitive prime factor of 10³^n - 1. A176351

Number of North-East lattice paths from (0,0) to (n,n) that do not cross the diagonal y = x at any even point (2·k,2·k). A376075

a(1) = 5, a(n) = smallest palindromic multiple of a(n-1) obtained by inserting digits anywhere in a(n-1). A82780