Write the following in Hindu-Arabic numerals:

$\overline{\mathrm{LXX}}\mathrm{IX}$

Is the Roman numeral $\overline{\mathrm{III}}\mathrm{CC}$ meaningless?

Is the Roman numeral $\mathrm{KKKCCX}$ meaningless?

Is the Roman numeral $\mathrm{XD}$ meaningless?

Is the Roman numeral $\mathrm{VC}$ meaningless?

The difference between the place value and face value of $8$ in $658742$ is