CREATE TABLE table_72855 ("Episode" TEXT, "Broadcast date" TEXT, "Run time" TEXT, "Viewers  ( in millions ) " TEXT, "Archive" TEXT)

How many viewers were there on 1august1964?
SELECT "Viewers (in millions)" FROM table_72855 WHERE "Broadcast date" = '1August1964'
SELECT "Viewers (in millions)" FROM "table_72855" WHERE "Broadcast date" = '1August1964'