Alright, let's work through 4242761 times 78889664 step by step
4242761 × 78889664 = 78889664 × (4242761)
+ 78889664 × 1 giving us 78889664
+ 78889664 × 60 that is equal 4733379840
+ 78889664 × 700 producing 55222764800
+ 78889664 × 2000 yielding 157779328000
+ 78889664 × 40000 yielding 3155586560000
+ 78889664 × 200000 resulting in 15777932800000
+ 78889664 × 4000000 yielding 315558656000000

= 334709989722304
