Properties of the Number 28981

Twenty-Eight Thousand Nine Hundred Eighty-One

Basics

Value: 28980 → 28981 → 28982

Parity: odd

Prime: No

Previous Prime: 28979

Next Prime: 29009

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 73 × 397

Divisors: 1, 73, 397, 28981

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111000100110101

Octal: 70465

Duodecimal: 14931

Hexadecimal: 7135

Square: 839898361

Square Root: 170.23806859806652

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

Expansion of 1/((1-x)*(1-8·x)*(1-9·x)). A16256

Greatest multiple of the n-th prime in A098962. A99620

A list of equal temperaments (equal divisions of the octave) whose nearest scale steps are closer and closer approximations to the pair of ratios 6/5 and 5/3 which generate two complementary musical harmonies, the Minor 3rd (6/5) and the Major 6th (5/3). A61919

a(1)=a(2)=1. a(n+1) = a(n) + a(smallest prime dividing n). A128216

Centered 12-gonal numbers which are semiprimes, intersection of A003154 and A001358. A218172

Strong pseudoprimes to base 96. A20322

a(n) = (2·n+1)*(11·n+1). A33575

Molien series for 16-dimensional group of structure S₃ and order 6, corresponding to complete weight enumerators of Hermitian self-dual GF(4)-linear codes over GF(16). A92496

Denominators of the best rational approximations of log(6/5)/log(2). A328883

Primes p such that p+1 is palindromic. A28981