Alright, let's work through 68478509 times 78220999 step by step
68478509 × 78220999 = 78220999 × (68478509)
+ 78220999 × 9 that is equal 703988991
+ 78220999 × 00 giving us 0
+ 78220999 × 500 that results in 39110499500
+ 78220999 × 8000 resulting in 625767992000
+ 78220999 × 70000 what gives us 5475469930000
+ 78220999 × 400000 giving us 31288399600000
+ 78220999 × 8000000 that is equal 625767992000000
+ 78220999 × 60000000 producing 4693259940000000

= 5356457384010491
