Properties of the Number 28812

Twenty-Eight Thousand Eight Hundred Twelve

Basics

Value: 28811 → 28812 → 28813

Parity: even

Prime: No

Previous Prime: 28807

Next Prime: 28813

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 7 ⁴

Divisors: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 111000010001100

Octal: 70214

Duodecimal: 14810

Hexadecimal: 708c

Square: 830131344

Square Root: 169.74097914175

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

Numbers n such that A048767(n) = n. A48768

Primal codes of finite permutations on positive integers. A109297

Numbers k > 1 such that, in base 6, k and k² contain the same digits in the same proportion. A61660

Multiply by 1, add 1, multiply by 2, add 2, etc.; start with 3. A19466

Expansion of 1/(1-7·x)⁷. A36226

a(n) = 2·binomial(3·n,n) - 9·binomial(2·n,n). A357509

Secondary diagonal of array A089944, in which the n-th row is the n-th binomial transform of the natural numbers. A89946

Triangle read by rows: G(s, ρ) = ((s-1)!/s)*∑_i=0..s-1 ((s-i)/i!)*(s*ρ)ⁱ. A122525

Indices k of Gram points g(k) for successive negative maximal values of the Riemann ζ function on the critical line. A325932

Triangle read by rows: Take a hexagram with all diagonals drawn, as in A331908. Then T(n,k) = number of k-sided polygons in that figure for k = 3, 4, ..., n+5. A331909