Alright, let's work through 64671377 times 89210038 step by step
64671377 × 89210038 = 89210038 × (64671377)
+ 89210038 × 7 that results in 624470266
+ 89210038 × 70 that results in 6244702660
+ 89210038 × 300 giving us 26763011400
+ 89210038 × 1000 that is equal 89210038000
+ 89210038 × 70000 producing 6244702660000
+ 89210038 × 600000 what gives us 53526022800000
+ 89210038 × 4000000 that results in 356840152000000
+ 89210038 × 60000000 that equals 5352602280000000

= 5769335999682326
