Properties of the Number -28640

Twenty-Eight Thousand Six Hundred Forty

Basics

Value: -28641 → -28640 → -28639

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ⁵ × 5 × 179

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

7925 Try Today's Challenge

Representations

Binary: -110111111100000

Octal: -67740

Duodecimal: -146A8

Hexadecimal: -6fe0

Square: 820249600

Square Root: 169.23356641044944

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(n, k) = k⁴ - n⁴ + 2·k*n*(1 - k²*n²), read by rows. A123963

A characteristic triangle for the Euler totient function (A000010). A110032

Number of unlabeled planar trees (also called plane trees) with n nodes. A2995

Dowling numbers: e.g.f.: exp(x + (exp(b·x) - 1)/b) with b=2. A7405

Number of lattice paths from (0,0) to (n,n) using steps S={(k,0),(0,k),(r,r)|k>0,0<r<=2} which never go above the line y=x. A175939

Expansion of sum ( qⁿ / product( 1-q^k, k=1..6·n), n=0..inf ). A35298

a(n) = φ(A291789(n)). A291805

Triangle A(r,c) read by rows, which contains the row sums of the triangle T(n,k)= T(n-1,k-1)+((c-1)*k+1)*T(n-1,k) in column c. A111579

Number of (w,x,y) with all terms in {0,...,n} and w ≠ min(|w-x|, |x-y|). A213499

Partial sums of A267326. A264390