Twenty seven you're in heaven.

Anyway, it's the gear range, not the number that really matters. Also, I've never seen a bike that moves, no matter how many gears it has, without pedaling (except with the help of gravity or wind, etc.). E-Bikes? Turn the throttle and go. Or however it is you make it go. Really don't ever want to find out. Push a button? Never mind, really don't want to know.