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_28037619_2 (production_code VARCHAR, us_viewers__million_ VARCHAR)

### Question ###
How many production codes are there for the episode that had 4.36 million u.s. viewers?

### Accurate SQL ###

SELECT COUNT(production_code) FROM table_28037619_2 WHERE us_viewers__million_ = "4.36"