Properties of the Number 28420

Twenty-Eight Thousand Four Hundred Twenty

Basics

Value: 28419 → 28420 → 28421

Parity: even

Prime: No

Previous Prime: 28411

Next Prime: 28429

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 5 × 7 ² × 29

Divisors: 1, 2, 4, 5, 7, 10, 14, 20, 28, 29

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110111100000100

Octal: 67404

Duodecimal: 14544

Hexadecimal: 6f04

Square: 807696400

Square Root: 168.58232410309213

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

Number of integer partitions of n that cannot be partitioned into constant multisets with distinct block-sums. A381717

Triangular array T(n,k), read by rows: coefficients of strong divisibility sequence of polynomials p(1,x) = 1, p(2,x) = 2 + 5·x, p(n,x) = u·p(n-1,x) + v·p(n-2,x) for n >= 3, where u = p(2,x), v = 1 - 2·x - x². A367299

a(n) = n²*(n+1)*(2·n+1)/3. A98077

Consider all Pythagorean triples (Y-7,Y,Z); sequence gives Y values. A76295

A triangular sequence of coefficients from a three level exponential expansion function: f(x,t) = log(1 + t)*(1 - t)*exp(x*(t - t²)). A137455

Number of monomer-dimer tilings of n X n chessboard. A28420