Properties of the Number 81628

Eighty-One Thousand Six Hundred Twenty-Eight

Basics

Value: 81627 → 81628 → 81629

Parity: even

Prime: No

Previous Prime: 81619

Next Prime: 81629

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 20407

Divisors: 1, 2, 4, 20407, 40814, 81628

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10011111011011100

Octal: 237334

Duodecimal: 3B2A4

Hexadecimal: 13edc

Square: 6663130384

Square Root: 285.70614274110386

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

Let p = n-th prime == 3 mod 8; a(n) = sum of quadratic residues mod p that are < p/2. A282721

Number of rooted essentially 4-connected toroidal triangulations with n vertices. A289208

Number of permutations of decimal digits of 2ⁿ which yield a prime. A86151

a(n) = 2*(-1)ⁿ - (-5)ⁿ. A81628