Alright, let's work through 78225275 times 78406249 step by step
78225275 × 78406249 = 78406249 × (78225275)
+ 78406249 × 5 resulting in 392031245
+ 78406249 × 70 yielding 5488437430
+ 78406249 × 200 producing 15681249800
+ 78406249 × 5000 giving us 392031245000
+ 78406249 × 20000 resulting in 1568124980000
+ 78406249 × 200000 that equals 15681249800000
+ 78406249 × 8000000 that is equal 627249992000000
+ 78406249 × 70000000 which equals 5488437430000000

= 6133350389743475
