volume

volume of a sphere is $\frac{4}{3}\pi r^2$

plugging in 4, we have$\frac{4}{3}\pi*(4^2)=\frac{4}{3}\pi*16=\frac{4*16}{3}\pi=\frac{64}{3}\pi$

$\frac{64}{3}\pi\approx\boxed{67.02}$