Properties of the Number 28075

Twenty-Eight Thousand Seventy-Five

Basics

Value: 28074 → 28075 → 28076

Parity: odd

Prime: No

Previous Prime: 28069

Next Prime: 28081

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 5 ² × 1123

Divisors: 1, 5, 25, 1123, 5615, 28075

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110110110101011

Octal: 66653

Duodecimal: 142B7

Hexadecimal: 6dab

Square: 788205625

Square Root: 167.5559608011604

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

T(j,k) are the numerators s in the representation R = s/t + (2·sqrt(3)/π)*u/v of the resistance between two nodes separated by the distance (j,k) in an infinite triangular lattice of one-ohm resistors, where T(j,k), j >= 0, 0 <= k <= floor(j/2) is an irregular triangle read by rows. A355585

E.g.f.: ∏_k>=1 1 / (1 - x^k)^exp(x). A346547

Graham-Sloane-type lower bound on the size of a ternary (n,3,4) constant-weight code. A30504

Largest integer terms forming a self-convolution square-root of a sequence A132831 such that: A132831(n) <= 2·A132831(n-1) for n>0 with A132831(0)=1. A132832

Numbers n such that 6n and 12n are both the average of twin prime pairs. A177680

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 918", based on the 5-celled von Neumann neighborhood. A273748

Expansion of 1/((1-3x)(1-6x)(1-7x)(1-9x)). A28075