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_2112766_1 (broadcast_date VARCHAR, viewers__in_millions_ VARCHAR)

### Question ###
what is all the  broadcast date when viewers were 8.4 millions

### Accurate SQL ###

SELECT COUNT(broadcast_date) FROM table_2112766_1 WHERE viewers__in_millions_ = "8.4"