Alright, let's work through 84114128 times 8020442 step by step
84114128 × 8020442 = 8020442 × (84114128)
+ 8020442 × 8 what gives us 64163536
+ 8020442 × 20 giving us 160408840
+ 8020442 × 100 producing 802044200
+ 8020442 × 4000 that is equal 32081768000
+ 8020442 × 10000 which equals 80204420000
+ 8020442 × 100000 producing 802044200000
+ 8020442 × 4000000 producing 32081768000000
+ 8020442 × 80000000 that results in 641635360000000

= 674632485004576
