Alright, let's work through 31351997 times 68898490 step by step
31351997 × 68898490 = 68898490 × (31351997)
+ 68898490 × 7 that equals 482289430
+ 68898490 × 90 yielding 6200864100
+ 68898490 × 900 that is equal 62008641000
+ 68898490 × 1000 which equals 68898490000
+ 68898490 × 50000 resulting in 3444924500000
+ 68898490 × 300000 that results in 20669547000000
+ 68898490 × 1000000 that results in 68898490000000
+ 68898490 × 30000000 yielding 2066954700000000

= 2160105251784530
