527

Number
$527$ (five hundred and twenty-seven) is:
 * $17 \times 31$


 * The smallest number $n$ that needs $6$ numbers less than $n$ such that the product of their factorials is square


 * The $29$th number whose $\sigma$ value is square:

Also see

 * Smallest n needing 6 Numbers less than n so that Product of Factorials is Square