Properties of the Number 28089

Twenty-Eight Thousand Eighty-Nine

Basics

Value: 28088 → 28089 → 28090

Parity: odd

Prime: No

Previous Prime: 28087

Next Prime: 28097

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 3121

Divisors: 1, 3, 9, 3121, 9363, 28089

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110110110111001

Octal: 66671

Duodecimal: 14309

Hexadecimal: 6db9

Square: 788991921

Square Root: 167.59773268156107

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 k![4] + 2 is prime, where k![4] = A007662(k) = quadruple factorial. A283553

Starting numbers for which the RATS sequence has eventual period 3. A114613

T(n,k)=Number of nXk 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A300646

a(n) = ∑_{d divides n} (-1)^{d + n/d} * d³. A321559

Number of nX5 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A300643

Number of nX6 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A300644

Least composite k such that the concatenation of n consecutive composites, starting from k, is a prime. A281684

Expansion of 1/((1-3x)(1-7x)(1-8x)(1-9x)). A28089