Properties of the Number 28091

Twenty-Eight Thousand Ninety-One

Basics

Value: 28090 → 28091 → 28092

Parity: odd

Prime: No

Previous Prime: 28087

Next Prime: 28097

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 7 × 4013

Divisors: 1, 7, 4013, 28091

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 110110110111011

Octal: 66673

Duodecimal: 1430B

Hexadecimal: 6dbb

Square: 789104281

Square Root: 167.60369924318496

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 dissimilar ternary squarefree words of length n+1. A60688

Triangle T(n,k) in which the n-th row encodes the inverse of a 3n X 3n Jacobi matrix, with 1's on the lower, main, and upper diagonals in GF(2), where the encoding consists of the decimal representations for the binary rows (n >= 1, 1 <= k <= 3n). A363146

Number of Lucasian primes less than 10ⁿ. A307121

Number of nX6 0..1 arrays with every element unequal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A317861

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 0), (-1, 0, 1), (1, -1, -1), (1, 1, 0)}. A148606

T(n,k)=Number of nXk 0..1 arrays with every element unequal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A317863

Expansion of 1/((1-3x)(1-7x)(1-8x)(1-11x)). A28091