Alright, let's work through 8628 times 9791 step by step
8628 × 9791 = 9791 × (8628)
+ 9791 × 8 that is equal 78328
+ 9791 × 20 that equals 195820
+ 9791 × 600 that is equal 5874600
+ 9791 × 8000 which equals 78328000

= 84476748
