Alright, let's work through 7894 times 1664 step by step
7894 × 1664 = 1664 × (7894)
+ 1664 × 4 producing 6656
+ 1664 × 90 producing 149760
+ 1664 × 800 producing 1331200
+ 1664 × 7000 producing 11648000

= 13135616
