Alright, let's work through 78659629 times 61210309 step by step
78659629 × 61210309 = 61210309 × (78659629)
+ 61210309 × 9 giving us 550892781
+ 61210309 × 20 what gives us 1224206180
+ 61210309 × 600 which equals 36726185400
+ 61210309 × 9000 giving us 550892781000
+ 61210309 × 50000 yielding 3060515450000
+ 61210309 × 600000 that is equal 36726185400000
+ 61210309 × 8000000 yielding 489682472000000
+ 61210309 × 70000000 producing 4284721630000000

= 4814780196915361
