Alright, let's work through 77663974 times 74775782 step by step
77663974 × 74775782 = 74775782 × (77663974)
+ 74775782 × 4 giving us 299103128
+ 74775782 × 70 yielding 5234304740
+ 74775782 × 900 yielding 67298203800
+ 74775782 × 3000 producing 224327346000
+ 74775782 × 60000 that equals 4486546920000
+ 74775782 × 600000 giving us 44865469200000
+ 74775782 × 7000000 giving us 523430474000000
+ 74775782 × 70000000 what gives us 5234304740000000

= 5807384389077668
