Properties of the Number 28140

Twenty-Eight Thousand One Hundred Forty

Basics

Value: 28139 → 28140 → 28141

Parity: even

Prime: No

Previous Prime: 28123

Next Prime: 28151

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 ² × 3 × 5 × 7 × 67

Divisors: 1, 2, 3, 4, 5, 6, 7, 10, 12, 14

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 110110111101100

Octal: 66754

Duodecimal: 14350

Hexadecimal: 6dec

Square: 791859600

Square Root: 167.74981371077584

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

a(n) is the concatenation of n and 5n. A19553

a(n) = n*(n+1)*(n² + 2)/6. A71239

E.g.f.: A(x) = ∏_n>=1 (1 + xⁿ/n)ⁿ. A181541

Smallest number k such that prime(n) is the n-th divisor of k. A221647

T(n, k) = [x^k] n! [tⁿ] 1/(exp((V*(2 + 2·t + V))/(4·t))*sqrt(1 + V)) where V = W(-2·t*x) and W denotes the Lambert function. Table read by rows, T(n, k) for 0 <= k <= n. A343806

a(n) = n*(n+1)*(7·n-6)/2. A256718

a(n) = 3·n³ + n² - 4·n. A83127

Square array A(n,k) (n>=1, k>=1) read by antidiagonals: A(n,k) is the number of n-colorings of the prism graph Y_k on 2k vertices. A277443

1/4 the number of n X n 0..3 symmetric matrices with every element equal to one, two or four horizontal and vertical neighbors. A211089

E.g.f. satisfies: A(x) = ∑_n>=0 Integral( A(x)ⁿ dx )ⁿ/n!, where the constant of integration is zero. A232552