Properties of the Number 28728

Twenty-Eight Thousand Seven Hundred Twenty-Eight

Basics

Value: 28727 → 28728 → 28729

Parity: even

Prime: No

Previous Prime: 28723

Next Prime: 28729

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 ³ × 3 ³ × 7 × 19

Divisors: 1, 2, 3, 4, 6, 7, 8, 9, 12, 14

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 111000000111000

Octal: 70070

Duodecimal: 14760

Hexadecimal: 7038

Square: 825297984

Square Root: 169.49336270190642

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

Denominator of B_2n/(-4n), where B_m are the Bernoulli numbers. A6863

a(n) = floor(n*(n-1)*(n-2)*(n-3)/5). A11915

Largest number m such that aⁿ == 1 (mod m) whenever a is coprime to m. A79612

Largest number k such that the reduced totient function ψ(k) = A002174(n). A143407

Numbers n for which there exists k > n such that A000203(k) = A000203(n) and A007947(k) = A007947(n), where A000203 gives the sum of divisors, and A007947 gives the squarefree kernel of n. A255334

Eisenstein series E₁₈(q) (alternate convention E₉(q)), multiplied by 43867. A279892

Number of edges among all distinct circles that can be constructed from a point on the origin and n equally spaced points on each of the +x,-x,+y,-y coordinates axes using only a compass. A356358

Numbers with prime factorization p·q*r³*s³ (where p, q, r, s are distinct primes). A190108

Denominators of expansion of 1/x+1/log(1-x). A75178

Row sums in A083167. A83170