Context: CREATE TABLE table_name_28 (geo_id VARCHAR, ansi_code VARCHAR, water__sqmi_ VARCHAR, township VARCHAR)
Question: What is the number of GEO IDs for areas in Riggin township with water area over 0.587 sq mi and ANSI codes over 1759257?
Answer: SELECT COUNT(geo_id) FROM table_name_28 WHERE water__sqmi_ > 0.587 AND township = "riggin" AND ansi_code > 1759257