CREATE TABLE table_73658 ("Episode no." FLOAT, "Airdate" CLOB, "Viewers" FLOAT, "BBC Three weekly ranking" CLOB, "Cable rank" CLOB)

How many viewers were there for airdate is 22 october 2009?
SELECT MAX("Viewers") FROM table_73658 WHERE "Airdate" = '22 October 2009'
SELECT MAX("Viewers") FROM "table_73658" WHERE "Airdate" = '22 October 2009'