828

828 is a natural number that follows 827 and precedes 829. In mathematics, 828 has several notable properties and representations.

The prime factorization of 828 is 2^2 × 3^2 × 23, giving it 18 positive divisors. The sum of its digits is 18, so 828 is a Harshad (Niven) number in base 10, since 828 is divisible by 18. The sum of proper divisors is 1356, which is greater than 828, making 828 an abundant number. The digits form a palindrome in base 10, and it is divisible by 9 (828 ÷ 9 = 92). In other numeral bases, 828 is represented as 1100111100 in binary and 0x33C in hexadecimal, while in Roman numerals it is written as DCCCXXVIII.

In telecommunications, 828 is an assigned area code for the western third of North Carolina, United States. It serves areas including Asheville, Hendersonville, Hickory, Morganton, and the surrounding mountains. The 828 area code was created in 1998 as a split from the 704 area code to accommodate growth in the region.

As a year, 828 CE falls in the early medieval period. While specific events are outside the scope of a numeric overview, the year is part of the broader historical record of the 9th century.