Properties of the Number 28220

Twenty-Eight Thousand Two Hundred Twenty

Basics

Value: 28219 → 28220 → 28221

Parity: even

Prime: No

Previous Prime: 28219

Next Prime: 28229

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5 × 17 × 83

Divisors: 1, 2, 4, 5, 10, 17, 20, 34, 68, 83

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110111000111100

Octal: 67074

Duodecimal: 143B8

Hexadecimal: 6e3c

Square: 796368400

Square Root: 167.98809481626964

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) = dot_product(n,n-1,...2,1)*(5,6,...,n,1,2,3,4). A26060

Expansion of 1/(1 + 1/(1 - x) - ∏_k>=1 (1 + x^k)). A317536

Number of binary [ n,5 ] codes of dimension <= 5 without zero columns. A34339

a(n) = 16·n² - 4. A158443

Number of integer partitions of 2n with exactly n distinct sums of nonempty submultisets. A365660

Integers k such that 10^k + 63 is a prime number. A135115

Starting positions of strings of three 4's in the decimal expansion of π. A83615

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 237", based on the 5-celled von Neumann neighborhood. A270982

Expansion of 1/((1-7x)(1-8x)(1-9x)(1-11x)). A28220