Alright, let's work through 78709657 times 73140366 step by step
78709657 × 73140366 = 73140366 × (78709657)
+ 73140366 × 7 yielding 511982562
+ 73140366 × 50 resulting in 3657018300
+ 73140366 × 600 yielding 43884219600
+ 73140366 × 9000 what gives us 658263294000
+ 73140366 × 00000 producing 0
+ 73140366 × 700000 yielding 51198256200000
+ 73140366 × 8000000 which equals 585122928000000
+ 73140366 × 70000000 that is equal 5119825620000000

= 5756853120714462
