Properties of the Number 66400

Sixty-Six Thousand Four Hundred

Basics

Value: 66399 → 66400 → 66401

Parity: even

Prime: No

Previous Prime: 66383

Next Prime: 66403

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ⁵ × 5 ² × 83

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

2730 Try Today's Challenge

Representations

Binary: 10000001101100000

Octal: 201540

Duodecimal: 32514

Hexadecimal: 10360

Square: 4408960000

Square Root: 257.6819745345025

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 right isosceles triangles that can be formed from the n² points of n X n grid of points (or geoboard). A187452

a(n) = [xⁿ] (∑_k=0..n (k+1)!*x^k)/(∑_k=0..n (k+1)!*(-x)^k). A303566

Numbers n such that every digit of both n and n² contains a loop (only digits 0,4,6,8,9 in n and n²). A107626

a(n) = ((4+sqrt(3))*(1+sqrt(3))ⁿ + (4-sqrt(3))*(1-sqrt(3))ⁿ)/2. A162559

Numbers k such that k and k² use only the digits 0, 4, 6, 8 and 9. A136956

Smallest values of t arising in R. L. Graham's sequence (A006255). A66400