Alright, let's work through 76984621 times 8780129 step by step
76984621 × 8780129 = 8780129 × (76984621)
+ 8780129 × 1 that equals 8780129
+ 8780129 × 20 what gives us 175602580
+ 8780129 × 600 that equals 5268077400
+ 8780129 × 4000 resulting in 35120516000
+ 8780129 × 80000 that equals 702410320000
+ 8780129 × 900000 producing 7902116100000
+ 8780129 × 6000000 that is equal 52680774000000
+ 8780129 × 70000000 that is equal 614609030000000

= 675934903396109
