628890 has 16 divisors (see below), whose sum is σ = 1509408. Its totient is φ = 167696.

The previous prime is 628877. The next prime is 628909. The reversal of 628890 is 98826.

It is a nialpdrome in base 15.

It is an unprimeable number.

628890 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10452 + ... + 10511.

It is an arithmetic number, because the mean of its divisors is an integer number (94338).

2⁶²⁸⁸⁹⁰ is an apocalyptic number.

628890 is an abundant number, since it is smaller than the sum of its proper divisors (880518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628890 is a wasteful number, since it uses less digits than its factorization.

628890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20973.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 628890 is about 793.0258507766. The cubic root of 628890 is about 85.6758120984.

The spelling of 628890 in words is "six hundred twenty-eight thousand, eight hundred ninety".