Properties of the Number 66784

Sixty-Six Thousand Seven Hundred Eighty-Four

Basics

Value: 66783 → 66784 → 66785

Parity: even

Prime: No

Previous Prime: 66763

Next Prime: 66791

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 2 ⁵ × 2087

Divisors: 1, 2, 4, 8, 16, 32, 2087, 4174, 8348, 16696

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10000010011100000

Octal: 202340

Duodecimal: 32794

Hexadecimal: 104e0

Square: 4460102656

Square Root: 258.4260048834095

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

Number of compositions of n whose run-lengths are unimodal. A332726

Starts of runs of 4 consecutive positive negabinary-Niven numbers (A331728). A331824

T(n,k)=Number of nXk 0..2 arrays with every row and column running average nondecreasing rightwards and downwards, and the number of instances of each value within one of each other. A200777

Number of nX4 0..2 arrays with every row and column running average nondecreasing rightwards and downwards, and the number of instances of each value within one of each other. A200773

Numbers n such that φ(reverse(n)) = φ(reverse(n-1)) + φ(reverse(n-2)). A69969

Numbers n such that (n, σ(n)) lies on the hyperbola y² - x² = m², for some natural number m, i.e., σ(n)² - n² = m². A66784