Properties of the Number 64820

Sixty-Four Thousand Eight Hundred Twenty

Basics

Value: 64819 → 64820 → 64821

Parity: even

Prime: No

Previous Prime: 64817

Next Prime: 64849

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5 × 7 × 463

Divisors: 1, 2, 4, 5, 7, 10, 14, 20, 28, 35

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1111110100110100

Octal: 176464

Duodecimal: 31618

Hexadecimal: fd34

Square: 4201632400

Square Root: 254.59772190654024

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) = n*(2·n² + n + 1)/2. A85786

Number of permutations avoiding the patterns {2413,2431,4213,3412,3421,4231,4321,4312}; number of strong sorting class based on 2413. A111281

Number of n-node triangulations of the double torus S₂ in which every node has degree >= 6. A129037

Multiples of 1852. A303272

a(n) = n*(2·n - 3 - (-1)ⁿ)*(11·n + (-1)ⁿ)/24. A308026

a(n) = ∏_k=1..4·n-9 prime(k) - prime(4n)⁴ where prime(i) = i-th prime. A64820