Properties of the Number 68641

Sixty-Eight Thousand Six Hundred Forty-One

Basics

Value: 68640 → 68641 → 68642

Parity: odd

Prime: No

Previous Prime: 68639

Next Prime: 68659

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 83 × 827

Divisors: 1, 83, 827, 68641

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: Yes

Tetrahedral: No

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Representations

Binary: 10000110000100001

Octal: 206041

Duodecimal: 33881

Hexadecimal: 10c21

Square: 4711586881

Square Root: 261.99427474660587

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

Composite and every divisor (except 1) contains the digit 8. A62678

Number of subgroups of index n in free group of rank 3. A27837

Array T(n,k) = number of subgroups of index k in free group of rank n, read by antidiagonals. A49290

Number of well-formed formulas of length n in a formal propositional language with one unitary operator, one binary operator, and one propositional variable. A308616

The first of three consecutive heptagonal numbers the sum of which is equal to the sum of three consecutive primes. A298301

Heptagonal numbers (A000566) that are semiprimes (A001358). A259676

Numerators of continued fraction convergents to sqrt(739). A42422

Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,2 4,0 4,1 4,2 5,0 polyhexes in any orientation on a planar nXnXn triangular grid. A155426

Smallest n-digit palindromic triangular number, or 0 if no such number exists. A68641