Product of unique prime factors of a number

Question

Given $n=p^x q^y r^z$ (with p, q, and r prime), is there a name for the number $m = p q r $ or the function f(n) = m?

Eg.,
For $n = 52 = 2*2*13$, $m = 2*13 = 26$
For $n = 3300 = 2*2*3*5*5*11$, $m = 2*3*5*11 = 330$

Answer 1

This is called the radical of the integer. $$\text {rad} (n) = \prod_{p\,|\,n} p$$ where the product is taken over primes dividing $n$.

Quite a useful concept, which has gained some attention lately owing to its appearance in the abc conjecture.