Alright, let's work through 78129420 times 57909374 step by step
78129420 × 57909374 = 57909374 × (78129420)
+ 57909374 × 0 what gives us 0
+ 57909374 × 20 yielding 1158187480
+ 57909374 × 400 yielding 23163749600
+ 57909374 × 9000 that results in 521184366000
+ 57909374 × 20000 resulting in 1158187480000
+ 57909374 × 100000 that is equal 5790937400000
+ 57909374 × 8000000 resulting in 463274992000000
+ 57909374 × 70000000 that is equal 4053656180000000

= 4524425803183080
