Name the total number of area for 775927 population
CREATE TABLE "2004_enlargement" (
  "member_countries" text,
  "population" real,
  "area_km" real,
  "gdp_billion_us" text,
  "gdp_per_capita_us" real
);
SELECT COUNT("area_km") FROM "2004_enlargement" WHERE "population"=775927;