\[2\sqrt{14} = \sqrt{4 \cdot 14} = \sqrt{56};\ \]
\[6\sqrt{2} = \sqrt{36 \cdot 2} = \sqrt{72};\ \]
\[\sqrt{56} < \sqrt{64} < \sqrt{72}\]
\[\sqrt{56} < 8 < \sqrt{72}\]
\[Ответ:число\ 8.\]