Alright, let's work through 84978335 times 86791016 step by step
84978335 × 86791016 = 86791016 × (84978335)
+ 86791016 × 5 yielding 433955080
+ 86791016 × 30 what gives us 2603730480
+ 86791016 × 300 giving us 26037304800
+ 86791016 × 8000 producing 694328128000
+ 86791016 × 70000 yielding 6075371120000
+ 86791016 × 900000 resulting in 78111914400000
+ 86791016 × 4000000 which equals 347164064000000
+ 86791016 × 80000000 which equals 6943281280000000

= 7375356032638360
