Alright, let's work through 7642873 times 84415668 step by step
7642873 × 84415668 = 84415668 × (7642873)
+ 84415668 × 3 producing 253247004
+ 84415668 × 70 that results in 5909096760
+ 84415668 × 800 that is equal 67532534400
+ 84415668 × 2000 giving us 168831336000
+ 84415668 × 40000 yielding 3376626720000
+ 84415668 × 600000 yielding 50649400800000
+ 84415668 × 7000000 giving us 590909676000000

= 645178229734164
