Properties of the Number 80685

Eighty Thousand Six Hundred Eighty-Five

Basics

Value: 80684 → 80685 → 80686

Parity: odd

Prime: No

Previous Prime: 80683

Next Prime: 80687

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 × 11 × 163

Divisors: 1, 3, 5, 9, 11, 15, 33, 45, 55, 99

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011101100101101

Octal: 235455

Duodecimal: 3A839

Hexadecimal: 13b2d

Square: 6510069225

Square Root: 284.05105174950506

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

Denominators of continued fraction convergents to sqrt(747). A42439

Least k such that k-2^r is prime for n values of r. Index of the first occurrence of n in A109925. A109926

Decimal expansion of ∑_{p prime} 1/(p*(p-1)). A136141

Number of 17-smooth numbers <= n. A80685

Number of length n+4 0..6 arrays with no five consecutive elements with pattern ababa or abbba (possibly a=b) and new values 0..6 introduced in 0..6 order. A244181