628279 has 4 divisors (see below), whose sum is σ = 637200. Its totient is φ = 619360.

The previous prime is 628267. The next prime is 628289. The reversal of 628279 is 972826.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 628279 - 2¹⁹ = 103991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4354 + ... + 4495.

It is an arithmetic number, because the mean of its divisors is an integer number (159300).

2⁶²⁸²⁷⁹ is an apocalyptic number.

628279 is a deficient number, since it is larger than the sum of its proper divisors (8921).

628279 is an equidigital number, since it uses as much as digits as its factorization.

628279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8920.

The product of its digits is 12096, while the sum is 34.

The square root of 628279 is about 792.6405238190. The cubic root of 628279 is about 85.6480569090.

The spelling of 628279 in words is "six hundred twenty-eight thousand, two hundred seventy-nine".