CREATE TABLE table_28725 ("No." FLOAT, "#" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "U.S. air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

How many million U.S. viewers watched the episode with the production code 3x6004?
SELECT "U.S. viewers (million)" FROM table_28725 WHERE "Production code" = '3X6004'
SELECT "U.S. viewers (million)" FROM "table_28725" WHERE "Production code" = '3X6004'