Properties of the Number -66890

Sixty-Six Thousand Eight Hundred Ninety

Basics

Value: -66891 → -66890 → -66889

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 2 × 5 × 6689

Divisors: 1, 2, 5, 10, 6689, 13378, 33445, 66890

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10000010101001010

Octal: -202512

Duodecimal: -32862

Hexadecimal: -1054a

Square: 4474272100

Square Root: 258.63101128828305

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

a(n) = ∑_{k=0..floor(n/4)} binomial(2·k,k) * binomial(n-1,n-4·k). A393275

Number of lower triangles of a 5 X 5 0..n array with each element differing from all of its horizontal and vertical neighbors by one. A195001