Properties of the Number -2728

Seven Hundred Twenty-Eight

Basics

Value: -2729 → -2728 → -2727

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ³ × 11 × 31

Divisors: 1, 2, 4, 8, 11, 22, 31, 44, 62, 88

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: -101010101000

Octal: -5250

Duodecimal: -16B4

Hexadecimal: -aa8

Square: 7441984

Square Root: 52.230259428802384

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

G.f.: ∑_n>=0 (xⁿ⁺¹ + i)ⁿ / (1 + i·xⁿ)ⁿ⁺¹, in which the constant term is taken to be 1. A323690

Expansion of (8 / 7) * (1 - η(q)⁷ / η(q⁷)) - 7 * (η(q) * η(q⁷))³ in powers of q. A138810

Expansion of (χ(q³) / χ(q))⁶ + q / (χ(q³) / χ(q))⁶ in powers of q where χ() is a Ramanujan θ function. A156215

a(1) = 4; then alternately add -4 and multiply by -2. A96406

Number of partitions of n with distinct parts p(i) such that if i ≠ j, then |p(i) - p(j)| >= 3. A25157

Kaprekar numbers: positive numbers n such that n = q+r and n² = q·10^m+r, for some m >= 1, q >= 0 and 0 <= r < 10^m, with n ≠ 10^a, a >= 1. A6886

a(n) = n concatenated with n + 1. A1704

a(n) = floor(n*φ¹⁵), where φ is the golden ratio, A001622. A4930

a(n) = n*(n + 18). A98850

Fibonacci sequence beginning 2, 6. A22112