Question:
How many positive  cubes  divide $3!\cdot 5!\cdot 7!\,$?

Answer:
Written  as a product of primes, we have \[
3!\cdot 5!\cdot 7!=2^8\cdot 3^4\cdot 5^2\cdot 7.
\]A cube that is a factor has a prime factorization of the form $2^p\cdot 3^q\cdot 5^r\cdot 7^s$, where $p$, $q$, $r$, and $s$ are all multiples of 3. There are 3 possible values for $p$, which are  0, 3, and 6. There are 2 possible values for $q$, which are $0$ and $3$. The only value  for $r$ and for $s$ is 0. Hence, there are $\boxed{6} = 3\cdot 2\cdot1\cdot1$ distinct cubes that divide $3!\cdot 5!\cdot 7!$. They are

\begin{align*}
1 &= 2^03^05^07^0, \quad 8 = 2^33^05^07^0,\quad 27 = 2^03^35^07^0,\\
64 &= 2^63^05^07^0,\quad 216 = 2^33^35^07^0,\quad\text{and}\quad 1728 = 2^63^35^07^0.
\end{align*}