A slab of granite, with a density of $2\mathrm{.}75\frac{g}{m}L,$ has a volume of $(5\mathrm{.}7{10}^{{?}^{{?}^{?}}}3)m^3.$ What is its mass in $kg?$ For reference, $1m^3={10}^{6}mL.$ Use the correct number of significant figures and put your answer in proper scientific notation.