Simplify $\sqrt{64^3}$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Simplify $\sqrt{64^3}$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
512
Simplify $\sqrt{64^3}$.
train