CREATE TABLE table_27905664_1 (COUNT VARCHAR2, us_viewers__million_ VARCHAR2)

How many episode numbers had US viewership of 4.26 million?
SELECT COUNT AS № FROM table_27905664_1 WHERE us_viewers__million_ = "4.26"
SELECT "COUNT" AS "№" FROM "table_27905664_1" WHERE "4.26" = "us_viewers__million_"