Alright, let's work through 78498407 times 88999848 step by step
78498407 × 88999848 = 88999848 × (78498407)
+ 88999848 × 7 giving us 622998936
+ 88999848 × 00 what gives us 0
+ 88999848 × 400 giving us 35599939200
+ 88999848 × 8000 which equals 711998784000
+ 88999848 × 90000 which equals 8009986320000
+ 88999848 × 400000 that equals 35599939200000
+ 88999848 × 8000000 that is equal 711998784000000
+ 88999848 × 70000000 which equals 6229989360000000

= 6986346291242136
