Alright, let's work through 8405 times 8071 step by step
8405 × 8071 = 8071 × (8405)
+ 8071 × 5 that is equal 40355
+ 8071 × 00 that results in 0
+ 8071 × 400 that is equal 3228400
+ 8071 × 8000 that equals 64568000

= 67836755
