Alright, let's work through 53217890 times 78939075 step by step
53217890 × 78939075 = 78939075 × (53217890)
+ 78939075 × 0 that is equal 0
+ 78939075 × 90 resulting in 7104516750
+ 78939075 × 800 producing 63151260000
+ 78939075 × 7000 which equals 552573525000
+ 78939075 × 10000 that equals 789390750000
+ 78939075 × 200000 giving us 15787815000000
+ 78939075 × 3000000 that equals 236817225000000
+ 78939075 × 50000000 producing 3946953750000000

= 4200971010051750
