Alright, let's work through 53879954 times 73605473 step by step
53879954 × 73605473 = 73605473 × (53879954)
+ 73605473 × 4 yielding 294421892
+ 73605473 × 50 which equals 3680273650
+ 73605473 × 900 which equals 66244925700
+ 73605473 × 9000 what gives us 662449257000
+ 73605473 × 70000 producing 5152383110000
+ 73605473 × 800000 yielding 58884378400000
+ 73605473 × 3000000 producing 220816419000000
+ 73605473 × 50000000 giving us 3680273650000000

= 3965859499388242
