Alright, let's work through 77718370 times 4857921 step by step
77718370 × 4857921 = 4857921 × (77718370)
+ 4857921 × 0 yielding 0
+ 4857921 × 70 that is equal 340054470
+ 4857921 × 300 that results in 1457376300
+ 4857921 × 8000 that results in 38863368000
+ 4857921 × 10000 that equals 48579210000
+ 4857921 × 700000 giving us 3400544700000
+ 4857921 × 7000000 yielding 34005447000000
+ 4857921 × 70000000 that results in 340054470000000

= 377549701708770
