\[\boxed{\mathbf{469}.}\]
\[1)\ 16^{\frac{1}{2}} = \left( 4^{2} \right)^{\frac{1}{2}} = 4\]
\[2)\ 27^{\frac{2}{3}} = \left( 3^{3} \right)^{\frac{2}{3}} = 3^{2} = 9\]
\[3)\ 8^{\frac{1}{3}} = \left( 2^{3} \right)^{\frac{1}{3}} = 2\]
\[4)\ 64^{\frac{2}{3}} = \left( 4^{3} \right)^{\frac{2}{3}} = 4^{2} = 16\]
\[5)\ (16)^{- 0,75} = \left( 2^{4} \right)^{- 0,75} =\]
\[= 2^{- 3} = \frac{1}{8}\]
\[6)\ (9)^{- 1,5} = \left( 3^{2} \right)^{- 1,5} = 3^{- 3} = \frac{1}{27}\]