Properties of the Number 28098

Twenty-Eight Thousand Ninety-Eight

Basics

Value: 28097 → 28098 → 28099

Parity: even

Prime: No

Previous Prime: 28097

Next Prime: 28099

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 7 × 223

Divisors: 1, 2, 3, 6, 7, 9, 14, 18, 21, 42

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110110111000010

Octal: 66702

Duodecimal: 14316

Hexadecimal: 6dc2

Square: 789497604

Square Root: 167.62458053638792

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

Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k up-down cycles (0<=k<=n). A cycle (b(1), b(2), ...) is said to be up-down if, when written with its smallest element in the first position, it satisfies b(1)<b(2)>b(3)<... . A186358

a(n) = ((n + 1) - 9*(n + 1)² + 8*(n + 1)³)/6. A331987

Triangle read by rows, T(n, k) = A000670(n) * binomial(n, k). A362585

Low-temperature magnetization expansion for hexagonal lattice (Potts model, q=3). A57382

Array of coefficients of powers of x² for (S(2·n+1,x)/x)³, with Chebyshev's S polynomials A049310. A220665

Numbers k such that k is the average of four consecutive primes k-11, k-1, k+1 and k+11. A259025

Inverse Euler transform of Thue-Morse sequence A001285. A316149

Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,11. A64242

Number of squares (of another matrix) in the group GL(2,Z_n) described in sequence A000252. A68516

Numbers n such that 5·10ⁿ + 8·R_n - 7 is prime, where R_n = 11...1 is the repunit (A002275) of length n. A103022