Properties of the Number 28641

Twenty-Eight Thousand Six Hundred Forty-One

Basics

Value: 28640 → 28641 → 28642

Parity: odd

Prime: No

Previous Prime: 28631

Next Prime: 28643

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 9547

Divisors: 1, 3, 9547, 28641

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110111111100001

Octal: 67741

Duodecimal: 146A9

Hexadecimal: 6fe1

Square: 820306881

Square Root: 169.23652088128023

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 independent sets in rooted plane trees on n nodes. A7857

a(n) = 7·2^n-1 - 2·n - 5. A168617

Number of (n+1) X 6 binary arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors. A186458

Expansion of theta₃(q) * theta₃(q¹⁹) + theta₂(q) * theta₂(q¹⁹) in powers of q. A28641

Square array, read by antidiagonals, where row n+1 equals the partial sums of the previous row after removing the n-th term from row n for n>=0, with row 0 equal to all 1's. A130523