Alright, let's work through 7775 times 8640 step by step
7775 × 8640 = 8640 × (7775)
+ 8640 × 5 giving us 43200
+ 8640 × 70 that is equal 604800
+ 8640 × 700 what gives us 6048000
+ 8640 × 7000 which equals 60480000

= 67176000
