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_67871 ( "Member countries" text, "Population" real, "Area (km\u00b2)" real, "GDP (billion US$)" real, "GDP per capita (US$)" text )

### Question ###
What is the GDP of the place with over 54,292,038 people and an Area (km ) greater than 30,528?

### Accurate SQL ###

SELECT MIN("GDP (billion US$)") FROM table_67871 WHERE "Population" > '54,292,038' AND "Area (km\u00b2)" > '30,528'