Properties of the Number 28380

Twenty-Eight Thousand Three Hundred Eighty

Basics

Value: 28379 → 28380 → 28381

Parity: even

Prime: No

Previous Prime: 28351

Next Prime: 28387

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 5 × 11 × 43

Divisors: 1, 2, 3, 4, 5, 6, 10, 11, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110111011011100

Octal: 67334

Duodecimal: 14510

Hexadecimal: 6edc

Square: 805424400

Square Root: 168.46364592991569

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) = 2·binomial(n,3). A7290

Fifth column (m=4) of triangle A060556. A60558

a(n) = 2·A000447(n). A259110

Perimeters of more than one primitive 120-degree integer triangle. A350047

Fifth column (m=4) of triangle A060098. A60100

Number of (w,x,y) with all terms in {0,...,n} and |w-x| ≠ |x-y|. A212960

Numbers k such that there is a primitive Pythagorean triple with perimeter k and inradius r such that p + r, p - r, p + r² and |p - r²| are all prime. A392988

Sum of x·y²*z³ for positive integers x,y,z with x + y + z = n. A241205

Numbers whose distance to the nearest cube equals the distance to the nearest product of 3 consecutive integers (three-dimensional oblong). A342873

Numbers k such that 217·2^k+1 is prime. A32485