Alright, let's work through 31085543 times 63828808 step by step
31085543 × 63828808 = 63828808 × (31085543)
+ 63828808 × 3 that results in 191486424
+ 63828808 × 40 that is equal 2553152320
+ 63828808 × 500 that equals 31914404000
+ 63828808 × 5000 that equals 319144040000
+ 63828808 × 80000 yielding 5106304640000
+ 63828808 × 000000 resulting in 0
+ 63828808 × 1000000 that results in 63828808000000
+ 63828808 × 30000000 producing 1914864240000000

= 1984153155722744
