Alright, let's work through 78303602 times 56663739 step by step
78303602 × 56663739 = 56663739 × (78303602)
+ 56663739 × 2 what gives us 113327478
+ 56663739 × 00 that is equal 0
+ 56663739 × 600 giving us 33998243400
+ 56663739 × 3000 giving us 169991217000
+ 56663739 × 00000 which equals 0
+ 56663739 × 300000 resulting in 16999121700000
+ 56663739 × 8000000 giving us 453309912000000
+ 56663739 × 70000000 producing 3966461730000000

= 4436974866487878
