I don't know the full total but the two major ones were a 5.9 magnitude aftershock one minute later and a 5.6 magnitude aftershock eleven hours after the main tremor.
Data from the Incorporated Research Institutions for Seismology (see related link) The current count for aftershocks following the Feb 27th, 2010 Chilean Earthquake @ 06:34 GMT. (as of March 4th,...