Alright, let's work through 79423290 times 83657899 step by step
79423290 × 83657899 = 83657899 × (79423290)
+ 83657899 × 0 that results in 0
+ 83657899 × 90 producing 7529210910
+ 83657899 × 200 resulting in 16731579800
+ 83657899 × 3000 that results in 250973697000
+ 83657899 × 20000 that results in 1673157980000
+ 83657899 × 400000 yielding 33463159600000
+ 83657899 × 9000000 giving us 752921091000000
+ 83657899 × 70000000 yielding 5856052930000000

= 6644385573067710
