00648

00648 is a five-digit numeric string that can refer to different things depending on context. It is most commonly recognized as a ZIP code within the United States Postal Service system, assigned to a portion of Puerto Rico for mail delivery.

As a ZIP code, 00648 indicates a specific geographic area on the island of Puerto Rico. ZIP codes in this region are used to route mail and parcels efficiently and to organize regional postal services. The exact municipality or local communities covered by 00648 may be defined by USPS boundary updates and local postal operations.

In mathematics, 648 (the number represented by the digits in 00648) is a composite number with prime factorization 2^3 × 3^4. It is divisible by 2, 3, 4, 6, 8, 9, 12, 18, 27, 36, 54, 81, 162, 216, 324, and 648, and the sum of its digits (6+4+8) is 18, making it divisible by 9 as well. The number is also a base-10 Harshad number, since 648 divided by 18 equals 36.

Beyond postal and mathematical uses, the string "00648" can function as an alphanumeric identifier in inventory, cataloging, or data-record systems. The leading zeros help maintain a fixed width for sorting or display in databases and interfaces where five-digit formatting is required.

See also: Puerto Rico ZIP code system; Harshad numbers; fixed-width numeric identifiers.