Simply adding the flags will work provided you know for sure that each flag is a power of two, and that you don't go past 52 bits long (due to the amount a Double-precision float can hold, since that's what JS uses for numbers).
You cannot have more than 32, if you want to have bitwise operations. To perform bitwise operations, javascript converts the number value (which is held as an 8 byte float) to a 32-bit integer and then performs bitwise/bitshift operations on that value. It converts the resulting integer back to floating point before storing in the variable.
For more information see this Moz Dev Net article.
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