Table schema:
CREATE TABLE table_name_98 (hanyu_pinyin VARCHAR, gdp_2011__billion_yuan_ VARCHAR, regional_population_2010_ VARCHAR)

Question: Which Hanyu Pinyin has a GDP in 2011 larger than 688.02 billion yuan and a regional population of 8,700,400 in 2010?
SQL: SELECT hanyu_pinyin FROM table_name_98 WHERE gdp_2011__billion_yuan_ > 688.02 AND regional_population_2010_ = "8,700,400"