Properties of the Number 28118

Twenty-Eight Thousand One Hundred Eighteen

Basics

Value: 28117 → 28118 → 28119

Parity: even

Prime: No

Previous Prime: 28111

Next Prime: 28123

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 × 17 × 827

Divisors: 1, 2, 17, 34, 827, 1654, 14059, 28118

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 110110111010110

Octal: 66726

Duodecimal: 14332

Hexadecimal: 6dd6

Square: 790621924

Square Root: 167.68422704595682

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(n,k)=Number of nXk 0..2 arrays with no element less than a strict majority of its horizontal and antidiagonal neighbors. A232023

G.f.: ∑_n>=0 xⁿ * ((1+x)ⁿ + 2·i)ⁿ / (1 + 2·i*x*(1+x)ⁿ)ⁿ⁺¹, where i² = -1. A323684

Indices n of Gram points g(n) for successive positive maxima of the Riemann ζ function on critical line. A327543

Expansion of (1+x·C⁴)*C², where C = (1-(1-4·x)^1/2)/(2·x) is g.f. for Catalan numbers, A000108. A32952

Numbers n such that A078142(n) = A078142(n+1) = A078142(n+2), where A078142(n) is the sum of the differences of the distinct prime factors p of n and the next square larger than p. A73938

a(n) = M(2ⁿ), where M(n) is Mertens's function, A002321. A84236

Number of 2 X n 0..2 arrays with no element less than a strict majority of its horizontal and antidiagonal neighbors. A232024

Numbers k such that s(k) = s(k+1) but φ(k) ≠ φ(k+1), where s(k) = φ(k) + φ(φ(k)) + ... + 1 is the sum of iterated φ (A092693). A291177

Numbers whose base-5 representation contains exactly three 3's and three 4's. A45307

Expansion of 1/((1-4x)(1-5x)(1-7x)(1-11x)). A28118