Alright, let's work through 89985775 times 86673296 step by step
89985775 × 86673296 = 86673296 × (89985775)
+ 86673296 × 5 yielding 433366480
+ 86673296 × 70 producing 6067130720
+ 86673296 × 700 that results in 60671307200
+ 86673296 × 5000 yielding 433366480000
+ 86673296 × 80000 that is equal 6933863680000
+ 86673296 × 900000 that results in 78005966400000
+ 86673296 × 9000000 that equals 780059664000000
+ 86673296 × 80000000 what gives us 6933863680000000

= 7799363712364400
