CREATE TABLE table_27713890_1 (production_code INT, us_viewers__millions_ VARCHAR)

What is the production code that had 24.8 million u.s. viewers?
SELECT MAX(production_code) FROM table_27713890_1 WHERE us_viewers__millions_ = "24.8"
SELECT MAX("production_code") FROM "table_27713890_1" WHERE "24.8" = "us_viewers__millions_"