Alright, let's work through 78431523 times 77213668 step by step
78431523 × 77213668 = 77213668 × (78431523)
+ 77213668 × 3 what gives us 231641004
+ 77213668 × 20 resulting in 1544273360
+ 77213668 × 500 that is equal 38606834000
+ 77213668 × 1000 resulting in 77213668000
+ 77213668 × 30000 that is equal 2316410040000
+ 77213668 × 400000 that equals 30885467200000
+ 77213668 × 8000000 that equals 617709344000000
+ 77213668 × 70000000 what gives us 5404956760000000

= 6055985577656364
