Alright, let's work through 5376783 times 74178748 step by step
5376783 × 74178748 = 74178748 × (5376783)
+ 74178748 × 3 resulting in 222536244
+ 74178748 × 80 resulting in 5934299840
+ 74178748 × 700 that results in 51925123600
+ 74178748 × 6000 producing 445072488000
+ 74178748 × 70000 which equals 5192512360000
+ 74178748 × 300000 that results in 22253624400000
+ 74178748 × 5000000 producing 370893740000000

= 398843031207684
