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_name_73 (population_in_millions VARCHAR, gdp_2012_millions_of_euro VARCHAR)

### Question ###
What is Population in Millions, when GDP 2012 Millions of Euro is 600,638?

### Accurate SQL ###

SELECT population_in_millions FROM table_name_73 WHERE gdp_2012_millions_of_euro = "600,638"