610

610 is the natural number that follows 609 and precedes 611. In mathematics it is an even composite number with prime factorization 2 × 5 × 61, and it is written in Roman numerals as DCX.

Historically, the year 610 CE is cited in various traditions. In Islamic tradition, it marks the beginning of the Prophet Muhammad’s revelations, according to sources that describe the first encounter with the angel Gabriel.

Geographically and in telecommunications, 610 is an area code for parts of eastern Pennsylvania in the United States. It serves regions in the Lehigh Valley and surrounding areas and was introduced in the 1990s as a split from 215; it now operates in an overlay arrangement with the 484 area code.

In transportation, Interstate 610 (I-610) refers to the Houston Beltway in Texas, a major loop that encircles central Houston. The designation I-610 is most commonly associated with this beltway, though similar loop numbers appear in other states for different routes.

As a number, 610 also appears in various cataloging, labeling, and numerical contexts, but the most widely recognized uses of the term in public reference are its mathematical properties, its association with the year 610 CE in historical and religious contexts, the eastern Pennsylvania area code, and the Houston beltway.