Properties of the Number 28566

Twenty-Eight Thousand Five Hundred Sixty-Six

Basics

Value: 28565 → 28566 → 28567

Parity: even

Prime: No

Previous Prime: 28559

Next Prime: 28571

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ³ × 23 ²

Divisors: 1, 2, 3, 6, 9, 18, 23, 27, 46, 54

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110111110010110

Octal: 67626

Duodecimal: 14646

Hexadecimal: 6f96

Square: 816016356

Square Root: 169.01479225203929

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

Triangle T, read by rows, where T(n,k) = ∑_j=1..n-k-1 [T^j](n-1,k) with T(n+1,n) = 2·n+1 and T(n,n)=0 for n>=0, where T^j denotes the j-th matrix power of T. A243920

Pairs of Pythagorean numbers differing by 6. A228875

a(n) = ∑_i=1..n-1(i^n-2) mod n⁴. A284760

Upper Pythagorean twins. A228877

Numbers for which the number of prime divisors counted with multiplicity and the sum of the distinct prime divisors are both perfect. A233563

Differences of the increasing arithmetic progression a²+a, b²+b, c²+c, where b = 5·a+2, c = 7·a+3 and a >= 0. A260955

a(n) is the number of exterior top arches (no covering arch) for semi-meanders in generation n+1 that are generated by semi-meanders with n top arches and floor(n/2) exterior top arches using the exterior arch splitting algorithm. A366415

Triangle T(n,k) read by rows: T(n,k) = -binomial(n+1,k) + ∑_i=0..k ∑_j=0..i+1 (i+1)^n-i+j*(-1)^k-i/(j!*(k-i)!) for 0 <= k <= n. A380179

Numbers k such that (in base 10) the k-th composite is a substring of the k-th prime. A378491

a(n) = n*(n+8). A28566