Alright, let's work through 80896879 times 5247040 step by step
80896879 × 5247040 = 5247040 × (80896879)
+ 5247040 × 9 which equals 47223360
+ 5247040 × 70 resulting in 367292800
+ 5247040 × 800 that is equal 4197632000
+ 5247040 × 6000 which equals 31482240000
+ 5247040 × 90000 giving us 472233600000
+ 5247040 × 800000 which equals 4197632000000
+ 5247040 × 0000000 which equals 0
+ 5247040 × 80000000 producing 419763200000000

= 424469159988160
