Alright, let's work through 5599647 times 70890721 step by step
5599647 × 70890721 = 70890721 × (5599647)
+ 70890721 × 7 yielding 496235047
+ 70890721 × 40 that is equal 2835628840
+ 70890721 × 600 that results in 42534432600
+ 70890721 × 9000 that is equal 638016489000
+ 70890721 × 90000 that equals 6380164890000
+ 70890721 × 500000 that equals 35445360500000
+ 70890721 × 5000000 which equals 354453605000000

= 396963013175487
