Alright, let's work through 54129279 times 89990341 step by step
54129279 × 89990341 = 89990341 × (54129279)
+ 89990341 × 9 that is equal 809913069
+ 89990341 × 70 that equals 6299323870
+ 89990341 × 200 that results in 17998068200
+ 89990341 × 9000 what gives us 809913069000
+ 89990341 × 20000 that equals 1799806820000
+ 89990341 × 100000 resulting in 8999034100000
+ 89990341 × 4000000 that is equal 359961364000000
+ 89990341 × 50000000 what gives us 4499517050000000

= 4871112275294139
