No problem, we've got 39784359 and 64378013 to multiply
39784359 × 64378013 = 64378013 × (39784359)
+ 64378013 × 9 which equals 579402117
+ 64378013 × 50 what gives us 3218900650
+ 64378013 × 300 which equals 19313403900
+ 64378013 × 4000 which equals 257512052000
+ 64378013 × 80000 that results in 5150241040000
+ 64378013 × 700000 yielding 45064609100000
+ 64378013 × 9000000 that results in 579402117000000
+ 64378013 × 30000000 that equals 1931340390000000

= 2561237980898667
