Properties of the Number 28616

Twenty-Eight Thousand Six Hundred Sixteen

Basics

Value: 28615 → 28616 → 28617

Parity: even

Prime: No

Previous Prime: 28607

Next Prime: 28619

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ³ × 7 ² × 73

Divisors: 1, 2, 4, 7, 8, 14, 28, 49, 56, 73

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110111111001000

Octal: 67710

Duodecimal: 14688

Hexadecimal: 6fc8

Square: 818875456

Square Root: 169.162643630324

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

Hit polynomials; convolution of natural numbers with Fibonacci numbers F(2), F(3), F(4), .... A1891

Number of unlabeled simple graphs covering n vertices with a unique triangle. A372174

Triangle read by rows: T(n,k) = (2ⁿ⁺¹-1)*binomial(n,k). A134346

Numbers k such that card({x|σ(x)=k}) > 1 and (∑_σ(x)=k x) < k. A258931

G.f.: ∑_n>=0 xⁿ * (1 + xⁿ)ⁿ / (1 - xⁿ⁺¹)ⁿ⁺¹. A325046

Octagonal numbers which are the sums of exactly two positive octagonal numbers. A136346

Number of (n+2) X 3 binary arrays avoiding patterns 001 and 110 in rows, columns and nw-to-se diagonals. A202440

Number of (n+1) X (4+1) 0..2 arrays with no 2 X 2 subblock having the sum of its diagonal elements greater than the absolute difference of its antidiagonal elements. A251084

Number of (n+1) X (7+1) 0..2 arrays with no 2 X 2 subblock having the sum of its diagonal elements greater than the absolute difference of its antidiagonal elements. A251087

a(n) is the end square spiral number for a knight starting on square n moving on a board with squares numbered with the square of their distance from the 0-square origin and where the knight moves to the smallest numbered unvisited square; the smallest spiral number ordering is used if the distances are equal. A326931