No problem, we've got 80289878 and 98223169 to multiply
80289878 × 98223169 = 98223169 × (80289878)
+ 98223169 × 8 what gives us 785785352
+ 98223169 × 70 that equals 6875621830
+ 98223169 × 800 resulting in 78578535200
+ 98223169 × 9000 which equals 884008521000
+ 98223169 × 80000 resulting in 7857853520000
+ 98223169 × 200000 that equals 19644633800000
+ 98223169 × 0000000 giving us 0
+ 98223169 × 80000000 which equals 7857853520000000

= 7886326255783382
