Alright, let's work through 79787683 times 78884901 step by step
79787683 × 78884901 = 78884901 × (79787683)
+ 78884901 × 3 what gives us 236654703
+ 78884901 × 80 which equals 6310792080
+ 78884901 × 600 producing 47330940600
+ 78884901 × 7000 what gives us 552194307000
+ 78884901 × 80000 yielding 6310792080000
+ 78884901 × 700000 that is equal 55219430700000
+ 78884901 × 9000000 producing 709964109000000
+ 78884901 × 70000000 producing 5521943070000000

= 6294043474474383
