Alright, let's work through 6371847 times 79720102 step by step
6371847 × 79720102 = 79720102 × (6371847)
+ 79720102 × 7 which equals 558040714
+ 79720102 × 40 producing 3188804080
+ 79720102 × 800 that equals 63776081600
+ 79720102 × 1000 producing 79720102000
+ 79720102 × 70000 which equals 5580407140000
+ 79720102 × 300000 that is equal 23916030600000
+ 79720102 × 6000000 that is equal 478320612000000

= 507964292768394
