Alright, let's work through 73878799 times 79779136 step by step
73878799 × 79779136 = 79779136 × (73878799)
+ 79779136 × 9 which equals 718012224
+ 79779136 × 90 that is equal 7180122240
+ 79779136 × 700 yielding 55845395200
+ 79779136 × 8000 which equals 638233088000
+ 79779136 × 70000 that equals 5584539520000
+ 79779136 × 800000 which equals 63823308800000
+ 79779136 × 3000000 that is equal 239337408000000
+ 79779136 × 70000000 yielding 5584539520000000

= 5893986752937664
