Alright, let's work through 90890612 times 77875999 step by step
90890612 × 77875999 = 77875999 × (90890612)
+ 77875999 × 2 what gives us 155751998
+ 77875999 × 10 producing 778759990
+ 77875999 × 600 what gives us 46725599400
+ 77875999 × 0000 resulting in 0
+ 77875999 × 90000 that equals 7008839910000
+ 77875999 × 800000 producing 62300799200000
+ 77875999 × 0000000 giving us 0
+ 77875999 × 90000000 giving us 7008839910000000

= 7078197209221388
