No problem, we've got 86790116 and 81873453 to multiply
86790116 × 81873453 = 81873453 × (86790116)
+ 81873453 × 6 that equals 491240718
+ 81873453 × 10 which equals 818734530
+ 81873453 × 100 producing 8187345300
+ 81873453 × 0000 that results in 0
+ 81873453 × 90000 which equals 7368610770000
+ 81873453 × 700000 which equals 57311417100000
+ 81873453 × 6000000 giving us 491240718000000
+ 81873453 × 80000000 what gives us 6549876240000000

= 7105806483190548
