Alright, let's work through 78521432 times 54487702 step by step
78521432 × 54487702 = 54487702 × (78521432)
+ 54487702 × 2 resulting in 108975404
+ 54487702 × 30 resulting in 1634631060
+ 54487702 × 400 producing 21795080800
+ 54487702 × 1000 giving us 54487702000
+ 54487702 × 20000 which equals 1089754040000
+ 54487702 × 500000 that results in 27243851000000
+ 54487702 × 8000000 that equals 435901616000000
+ 54487702 × 70000000 yielding 3814139140000000

= 4278452387429264
