Properties of the Number 28731

Twenty-Eight Thousand Seven Hundred Thirty-One

Basics

Value: 28730 → 28731 → 28732

Parity: odd

Prime: No

Previous Prime: 28729

Next Prime: 28751

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 61 × 157

Divisors: 1, 3, 61, 157, 183, 471, 9577, 28731

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111000000111011

Octal: 70073

Duodecimal: 14763

Hexadecimal: 703b

Square: 825470361

Square Root: 169.50221237494216

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

a(n) = (n² - n + 1)*(n² + n + 1). A59826

a(n) = T(2n,n), T given by A026780. A26781

a(n) = T(n, floor(n/2)), T given by A026780. A26786

Numbers k such that k² is palindromic in base 13. A29998

Divide natural numbers in groups with prime(n) elements and add together. A34956

Sum of squares of divisors of square numbers. A65827

Sums of distinct powers of 13. A33049

E.g.f. satisfies: A(x) = ∑_n>=0 (-1)ⁿ/n! * ∑_k=0..n (-1)^k*C(n,k)*(1 + x·A(x)^k)^k. A195947

Nearest integer to 4 * π * n³ / 3. A2101

Ceiling(4/3*π*n³). A135973