CREATE TABLE table_11621915_1 (winner VARCHAR(255), purse__$__ VARCHAR(255), date VARCHAR(255))
what's the winner with purse( $ ) value of bigger than 964017.2297960471 and date value of may 28
    
SQL: SELECT winner FROM table_11621915_1 WHERE purse__$__ > 964017.2297960471 AND date = "May 28"