Alright, let's work through 79421125 times 98780475 step by step
79421125 × 98780475 = 98780475 × (79421125)
+ 98780475 × 5 which equals 493902375
+ 98780475 × 20 producing 1975609500
+ 98780475 × 100 producing 9878047500
+ 98780475 × 1000 yielding 98780475000
+ 98780475 × 20000 what gives us 1975609500000
+ 98780475 × 400000 what gives us 39512190000000
+ 98780475 × 9000000 producing 889024275000000
+ 98780475 × 70000000 giving us 6914633250000000

= 7845256452534375
