Alright, let's work through 64391874 times 58327997 step by step
64391874 × 58327997 = 58327997 × (64391874)
+ 58327997 × 4 producing 233311988
+ 58327997 × 70 that equals 4082959790
+ 58327997 × 800 that results in 46662397600
+ 58327997 × 1000 that equals 58327997000
+ 58327997 × 90000 what gives us 5249519730000
+ 58327997 × 300000 that is equal 17498399100000
+ 58327997 × 4000000 that equals 233311988000000
+ 58327997 × 60000000 that equals 3499679820000000

= 3755849033496378
