Alright, let's work through 78087489 times 72464118 step by step
78087489 × 72464118 = 72464118 × (78087489)
+ 72464118 × 9 that is equal 652177062
+ 72464118 × 80 giving us 5797129440
+ 72464118 × 400 which equals 28985647200
+ 72464118 × 7000 yielding 507248826000
+ 72464118 × 80000 that results in 5797129440000
+ 72464118 × 000000 giving us 0
+ 72464118 × 8000000 which equals 579712944000000
+ 72464118 × 70000000 that results in 5072488260000000

= 5658541017219702
