Alright, let's work through 78749484 times 10031831 step by step
78749484 × 10031831 = 10031831 × (78749484)
+ 10031831 × 4 yielding 40127324
+ 10031831 × 80 yielding 802546480
+ 10031831 × 400 producing 4012732400
+ 10031831 × 9000 that is equal 90286479000
+ 10031831 × 40000 which equals 401273240000
+ 10031831 × 700000 yielding 7022281700000
+ 10031831 × 8000000 producing 80254648000000
+ 10031831 × 70000000 that is equal 702228170000000

= 790001514825204
