38
We start with the given inequality:
\[ 4n > 1719 \]
To isolate \( n \), we convert \( 4n \) as follows:
\[ 4n = \frac{16n}{4} \Rightarrow \frac{16n}{2} > 1719 \]
\[ \frac{16n}{2} > 1719 \Rightarrow \frac{n}{2} > 19 \]
\[ n > 38 \]
\[ \boxed{n > 38} \]
The largest $ n \in \mathbb{N} $ such that $ 3^n $ divides 50! is: