Alright, let's work through 90350513 times 61320777 step by step
90350513 × 61320777 = 61320777 × (90350513)
+ 61320777 × 3 that results in 183962331
+ 61320777 × 10 that equals 613207770
+ 61320777 × 500 which equals 30660388500
+ 61320777 × 0000 that equals 0
+ 61320777 × 50000 yielding 3066038850000
+ 61320777 × 300000 resulting in 18396233100000
+ 61320777 × 0000000 which equals 0
+ 61320777 × 90000000 which equals 5518869930000000

= 5540363659508601
