[riddle] whats common in these?!

Question: [riddle] whats common in these!?

1
8
19
77
ten times twenty eightWww@Enter-QA@Com

Answers:

they're all numbers
=]Www@Enter-QA@Com

yup all numbersWww@Enter-QA@Com

i agree wit tha first answererWww@Enter-QA@Com

they are all factors of 409,640Www@Enter-QA@Com

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