No problem, we've got 87964782 and 81137152 to multiply
87964782 × 81137152 = 81137152 × (87964782)
+ 81137152 × 2 what gives us 162274304
+ 81137152 × 80 resulting in 6490972160
+ 81137152 × 700 which equals 56796006400
+ 81137152 × 4000 producing 324548608000
+ 81137152 × 60000 resulting in 4868229120000
+ 81137152 × 900000 yielding 73023436800000
+ 81137152 × 7000000 which equals 567960064000000
+ 81137152 × 80000000 that results in 6490972160000000

= 7137211887780864
