Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_27047554_1 ( directed_by VARCHAR, us_viewers__in_millions_ VARCHAR )

### Question ###
How many directors directed an episode that reached 2.48 million viewers?

### Accurate SQL ###

SELECT COUNT(directed_by) FROM table_27047554_1 WHERE us_viewers__in_millions_ = "2.48"