Alright, let's work through 90042687 times 63802346 step by step
90042687 × 63802346 = 63802346 × (90042687)
+ 63802346 × 7 that equals 446616422
+ 63802346 × 80 that equals 5104187680
+ 63802346 × 600 which equals 38281407600
+ 63802346 × 2000 what gives us 127604692000
+ 63802346 × 40000 that results in 2552093840000
+ 63802346 × 000000 that is equal 0
+ 63802346 × 0000000 resulting in 0
+ 63802346 × 90000000 yielding 5742211140000000

= 5744934670743702
