3809332800

Appears in sequences

• Unitary superperfect numbers: numbers n such that usigma(usigma(n)) = 2*n, where usigma(n) is the sum of unitary divisors of n (A034448).at n=27A038843
• a(n) = Product_{i=1..floor(n/2)} (2n-i)*(2n+i).at n=8A249056