rad
The radical of an integer.
Syntax

rad(n)

n
is a positive integer

Description
If n
is a positive integer, then rad(n)
is the radical of n
, defined as the product of all distinct prime factors of n
. (The product of all prime factors, taken with multiplicity, would be n
itself.)
Hence, rad(n)
is the same as
∏(unique(PrimeFactors(n)))
Examples
rad(1024)
2
rad(19871226)
6623742