Alright, let's work through 78540474 times 10537842 step by step
78540474 × 10537842 = 10537842 × (78540474)
+ 10537842 × 4 that results in 42151368
+ 10537842 × 70 giving us 737648940
+ 10537842 × 400 what gives us 4215136800
+ 10537842 × 0000 which equals 0
+ 10537842 × 40000 resulting in 421513680000
+ 10537842 × 500000 that is equal 5268921000000
+ 10537842 × 8000000 giving us 84302736000000
+ 10537842 × 70000000 resulting in 737648940000000

= 827647105617108
