$p(x)=27x^3-64$
Find all the real number roots of $p$ and answer the following questions.
**How many times does the graph of $p$ intersect the $x$-axis ?**
[[☃ numeric-input 1]]
**What is the largest $x$-intercept of the graph of $p\ $?**
*Give your answer using exact terms.*
$($[[☃ expression 1]]$,0)$