Alright, let's work through 79724512 times 39489793 step by step
79724512 × 39489793 = 39489793 × (79724512)
+ 39489793 × 2 that results in 78979586
+ 39489793 × 10 that results in 394897930
+ 39489793 × 500 that equals 19744896500
+ 39489793 × 4000 resulting in 157959172000
+ 39489793 × 20000 that is equal 789795860000
+ 39489793 × 700000 that is equal 27642855100000
+ 39489793 × 9000000 resulting in 355408137000000
+ 39489793 × 70000000 which equals 2764285510000000

= 3148304475906016
