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99,999ninety-nine thousand, nine hundred and ninety-nine
The standard zip+4 will contain nine digits, 00000-0000. The last 4 digits are optional, but can be required with bulk mailing and to obtain certain discounts on commercial mail.
987654321 is the highest nine-digit number with no repeated digits.
999,999,992
It is, but not evenly. You get a number with digits after the decimal point.