Alright, let's work through 64673064 times 87148173 step by step
64673064 × 87148173 = 87148173 × (64673064)
+ 87148173 × 4 yielding 348592692
+ 87148173 × 60 that equals 5228890380
+ 87148173 × 000 that results in 0
+ 87148173 × 3000 resulting in 261444519000
+ 87148173 × 70000 giving us 6100372110000
+ 87148173 × 600000 that is equal 52288903800000
+ 87148173 × 4000000 which equals 348592692000000
+ 87148173 × 60000000 what gives us 5228890380000000

= 5636139369912072
