Properties of the Number 800

Eight Hundred

Basics

Value: 799 → 800 → 801

Parity: even

Prime: No

Previous Prime: 797

Next Prime: 809

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 2 ⁵ × 5 ²

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 25, 32

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1100100000

Octal: 1440

Duodecimal: 568

Hexadecimal: 320

Square: 640000

Square Root: 28.284271247461902

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

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

Powerful numbers, definition (1): if a prime p divides n then p² must also divide n (also called squareful, square full, square-full or 2-powerful numbers). A1694

a(n) = 2·n². A1105

Squares and twice squares. A28982

Powerful numbers (A001694) that are not prime powers (A000961). A286708

Generalized octagonal numbers: k*(3·k-2), k=0, +- 1, +- 2, +-3, ... A1082

a(n) = ceiling(n²/2). A982

Numbers of the form 2ⁱ*5^j with i, j >= 0. A3592

a(n) = floor(n²/2). A7590

a(1) = 0; for n > 1, a(n) = A000203(A156552(n)). A323243

Rhombic matchstick numbers: a(n) = n*(3·n+2). A45944