Properties of the Number 28129

Twenty-Eight Thousand One Hundred Twenty-Nine

Basics

Value: 28128 → 28129 → 28130

Parity: odd

Prime: No

Previous Prime: 28123

Next Prime: 28151

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 23 × 1223

Divisors: 1, 23, 1223, 28129

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110110111100001

Octal: 66741

Duodecimal: 14341

Hexadecimal: 6de1

Square: 791240641

Square Root: 167.71702358436963

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

Crystal ball sequence for D₈ lattice. A8362

Average of three successive primes squared, (prime(n)²+prime(n+1)²+prime(n+2)²)/3, n>=3. A75893

The smallest number k > 1 such that the total number of its prime factors, with multiplicity, equals that of the digit reversals of k when it is written in all bases 2 to n. A393264

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 90 ones. A31858

Number of binary strings of length n with no substrings equal to 0001 0011 or 0100. A164453

Numbers that are 5-digit palindromes in at least two bases. A180454

L.g.f.: ∑_n>=1 (xⁿ/n)/sqrt(1 - 2*(2·x)ⁿ) = ∑_n>=1 a(n)*xⁿ/n. A184513

Number of distinct eigenvalues of n X n matrices with elements {0, 1}. A306784

100000n+1, 100000n+3, 100000n+7, 100000n+9 are all primes. A64964

a(n) = least semiprime such that all subsets of {a(1),...,a(n)} have a different sum. A137371