Properties of the Number 28490

Twenty-Eight Thousand Four Hundred Ninety

Basics

Value: 28489 → 28490 → 28491

Parity: even

Prime: No

Previous Prime: 28477

Next Prime: 28493

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 × 5 × 7 × 11 × 37

Divisors: 1, 2, 5, 7, 10, 11, 14, 22, 35, 37

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 110111101001010

Octal: 67512

Duodecimal: 145A2

Hexadecimal: 6f4a

Square: 811680100

Square Root: 168.78981011897608

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

T(n,k)=Number of -k..k arrays x(0..n-1) of n elements with zeroth through n-1st differences all nonzero. A199943

Coefficients T(n,k) of xⁿ*y^k in the function A(x,y) that satisfies: y = ∑_n=-oo..+oo x^2·n+1 * (1 - xⁿ)ⁿ⁺¹ * A(x,y)ⁿ, as a triangle read by rows with k = 0..n for each row index n >= 0. A357400

a(n) is the difference between the largest and smallest integer solutions to n=x/π(x), where π(x) = A000720(x). A87236

Number of -n..n arrays x(0..3) of 4 elements with zeroth through 3rd differences all nonzero. A199945

Rademacher's partition formula extended to half-integers. a(n) = round(sqrt(48) * (cosh(h(n)) - sinh(h(n))/h(n)) / (24·n + 11)) where h(n) = sqrt(24·n + 11)*(π/6). A376876

Number of reduced magic borders of order n (these extend magic squares of order n-2 to order n). A91990

Number of -7..7 arrays x(0..n-1) of n elements with zeroth through n-1st differences all nonzero. A199942

Products of 5 distinct primes that are sandwiched between squarefree semiprime numbers. A376949

Triangle read by rows: T(n,k) = π(prime(k) * prime(n+1)). A284061

Erroneous version of A004064. A28490