A megahertz is one million (or 106) hertz.
See hertz, kilohertz (one thousand hertz), gigahertz[?] (109 hertz), terahertz[?] (1012 hertz), and petahertz[?] (1015 hertz).
... residing in the village. The population density is 105.9/km² (274.2/mi²). There are 578 housing units at an average density of 82.3/km² ...