Properties of the Number 68820

Sixty-Eight Thousand Eight Hundred Twenty

Basics

Value: 68819 → 68820 → 68821

Parity: even

Prime: No

Previous Prime: 68819

Next Prime: 68821

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 ² × 3 × 5 × 31 × 37

Divisors: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000110011010100

Octal: 206324

Duodecimal: 339B0

Hexadecimal: 10cd4

Square: 4736192400

Square Root: 262.3356628443796

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 n-node labeled graphs whose components are unicyclic graphs. A137916

Triangle read by rows where T(n,k) is the number of labeled loop-graphs on n vertices with k loops and n-k non-loops such that it is possible to choose a different vertex from each edge. A368924

Triangle T(n,k), n>=0, 0<=k<=n, read by rows: T(n,k) = number of simple graphs on n labeled nodes with k edges where each maximally connected subgraph has at most one cycle. A144228

Exponential reversion of rooted trees A000081. A50396

Number of -2..2 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^t+u+v) having two, four, six or eight distinct values for every i,j,k<=n. A211588

Triangle read by rows: T(n,k) (n>=1, 0<=k<n) is the number of permutations of n things that require k stack-sorts. A262494

Ulam numbers that are primes. A68820