Who called from 3604777964

Get calls from this number (and many others) all the time.  They leave no message when I don't pick up, which is ALWAYS.  If I don't recognize the number or AT LEAST the area code, I never answer.  Is there a way to block these callers?

Don't know how they got my cell number since I have a prepay plan net 10 . When I answered heard only a groan

Just got a call from this number on my wife's cell.  They hung up when I answered.

Recieved several calls from this number and they keep on hanging up.

When I picked up i heard a boat horn and then an automated voice saying if I filled out a survey I would get tickets on a cruise to the Bahamas.

I get sea sick, so naturally I hung up.