What is the population in 2010 for the longitude of -97.578927?
CREATE TABLE "o" (
  "township" text,
  "county" text,
  "pop_2010" real,
  "land_sqmi" real,
  "water_sqmi" real,
  "latitude" real,
  "longitude" real,
  "geo_id" real,
  "ansi_code" real
);
SELECT COUNT("pop_2010") FROM "o" WHERE "longitude"=-97.578927;