Alright, let's work through 77663958 times 69280038 step by step
77663958 × 69280038 = 69280038 × (77663958)
+ 69280038 × 8 resulting in 554240304
+ 69280038 × 50 which equals 3464001900
+ 69280038 × 900 producing 62352034200
+ 69280038 × 3000 which equals 207840114000
+ 69280038 × 60000 which equals 4156802280000
+ 69280038 × 600000 giving us 41568022800000
+ 69280038 × 7000000 that equals 484960266000000
+ 69280038 × 70000000 that equals 4849602660000000

= 5380561961470404
