What is the total population from the 2000 census for the municipality that has a 464.5 square km area and a population density in 2010 larger than 1840?
CREATE TABLE "municipalities" (
  "administrative_division" text,
  "area_km" real,
  "population_2000_census" real,
  "population_2010_census" real,
  "population_density_2010_km" real
);
SELECT COUNT("population_2000_census") FROM "municipalities" WHERE "area_km"=464.5 AND "population_density_2010_km">1840;