What is the GDP of the place with over 54,292,038 people and an Area (km²) greater than 30,528?
CREATE TABLE "foundation" (
  "member_countries" text,
  "population" real,
  "area_km" real,
  "gdp_billion_us" real,
  "gdp_per_capita_us" text
);
SELECT MIN("gdp_billion_us") FROM "foundation" WHERE "population">'54,292,038' AND "area_km">'30,528';