Alright, let's work through 72765384 times 77408478 step by step
72765384 × 77408478 = 77408478 × (72765384)
+ 77408478 × 4 giving us 309633912
+ 77408478 × 80 what gives us 6192678240
+ 77408478 × 300 giving us 23222543400
+ 77408478 × 5000 resulting in 387042390000
+ 77408478 × 60000 yielding 4644508680000
+ 77408478 × 700000 which equals 54185934600000
+ 77408478 × 2000000 that results in 154816956000000
+ 77408478 × 70000000 that results in 5418593460000000

= 5632657626525552
