Properties of the Number 81928

Eighty-One Thousand Nine Hundred Twenty-Eight

Basics

Value: 81927 → 81928 → 81929

Parity: even

Prime: No

Previous Prime: 81919

Next Prime: 81929

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 ³ × 7 ² × 11 × 19

Divisors: 1, 2, 4, 7, 8, 11, 14, 19, 22, 28

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10100000000001000

Octal: 240010

Duodecimal: 3B4B4

Hexadecimal: 14008

Square: 6712197184

Square Root: 286.2306762036522

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

G.f.: ∏_k>=1 (1+x^k)^2·k-1. A255835

T(2n+3,n), array T as in A055794. A55796

Row 2 in rectangular array A292929. A294065

a(n) = A351477(n) * FB where F is the Fermat point of a primitive integer-sided triangle ABC with A < B < C < 2*π/3 and FA + FB + FC = A336329(n). A351802

The smallest positive even integer that can be represented with n digits in base 3/2. A305498

Sum of the n smallest numbers having the sum of their digits equal to n. A81928

Longest side of primitive integer triangles with nonzero rational distances between three vertices and first isogonic center, sorted. A333391