CREATE TABLE table_1966992_1 (lga_name VARCHAR(255), census_2006_population VARCHAR(255), administrative_capital VARCHAR(255))
What is the LGA name where the 2006 census population is bigger than 425208.9417698913 and administrative capital is port harcourt?
    
SQL: SELECT lga_name FROM table_1966992_1 WHERE census_2006_population > 425208.9417698913 AND administrative_capital = "Port Harcourt"