Properties of the Number 28722

Twenty-Eight Thousand Seven Hundred Twenty-Two

Basics

Value: 28721 → 28722 → 28723

Parity: even

Prime: No

Previous Prime: 28711

Next Prime: 28723

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 4787

Divisors: 1, 2, 3, 6, 4787, 9574, 14361, 28722

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 111000000110010

Octal: 70062

Duodecimal: 14756

Hexadecimal: 7032

Square: 824953284

Square Root: 169.47566196949933

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

T(n,k)=Number of 0..3 arrays of length n+2·k-1 with sum less than 3·k in any length 2k subsequence (=less than 50% duty cycle). A213464

Triangle read by rows: T(n,k) is the number of simple graphs on n unlabeled nodes having chromatic number k, 1 <= k <= n. A84268

T(n,k)=Number of length n+k 0..3 arrays with at most two downsteps in every k consecutive neighbor pairs. A255660

Number of 5-chromatic (i.e., chromatic number equals 5) simple graphs on n nodes. A76281

The number of pairs of permutations in the product group S_n X S_n with k common descents, n >= 1 and 0 <= k <= n-1. A192721

Triangle read by rows: let a(n,k) = number of graphs on n nodes with chromatic number k; T(n,k) = a(n,n-k), n >= 2, k=0..n-2. A115597

Expansion of ∏_k>=0 ((1+x^3·k+1)/(1-x^3·k+1))³. A261651

Number of nonequivalent directed unicursal star polygons (no edge joins adjacent vertices) that can be formed by connecting the vertices of a regular n-gon up to rotations. A370068

Least k such that decimal representation of k·n contains only digits 0 and 6. A96685

Triangle read by rows, (∑_k=0..n T[n,k]*x^k) / (1-x)ⁿ⁺¹ are generating functions of the columns of A287316. A287315