Alright, let's work through 77498380 times 48540834 step by step
77498380 × 48540834 = 48540834 × (77498380)
+ 48540834 × 0 that is equal 0
+ 48540834 × 80 producing 3883266720
+ 48540834 × 300 that is equal 14562250200
+ 48540834 × 8000 that results in 388326672000
+ 48540834 × 90000 which equals 4368675060000
+ 48540834 × 400000 what gives us 19416333600000
+ 48540834 × 7000000 that results in 339785838000000
+ 48540834 × 70000000 giving us 3397858380000000

= 3761835998848920
