Properties of the Number 67640

Sixty-Seven Thousand Six Hundred Forty

Basics

Value: 67639 → 67640 → 67641

Parity: even

Prime: No

Previous Prime: 67631

Next Prime: 67651

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ³ × 5 × 19 × 89

Divisors: 1, 2, 4, 5, 8, 10, 19, 20, 38, 40

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10000100000111000

Octal: 204070

Duodecimal: 33188

Hexadecimal: 10838

Square: 4575169600

Square Root: 260.07691170113503

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) = A027052(n, 2n-3). A27059

a(n) = 169·n² + 2·n. A158220

Greatest number in row n of array T given by A027052. A27071

a(n) = ∑_k=0..n-1 T(n,k)*T(n,k+1), T given by A026736. A27216

Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 13. A31691

a(n) = ∑_k=0..n r₄(k² + 1), where r₄(k) is the number of ways of writing k as a sum of 4 squares (A000118). A333174

Table T(n,k) giving number of two-legged knot diagrams with n >= 0 self-intersections and k >= 0 tangencies, read by antidiagonals. A67640