628820 has 24 divisors (see below), whose sum is σ = 1378944. Its totient is φ = 240416.

The previous prime is 628819. The next prime is 628841. The reversal of 628820 is 28826.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 628820.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 628820.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224 + ... + 1143.

It is an arithmetic number, because the mean of its divisors is an integer number (57456).

2⁶²⁸⁸²⁰ is an apocalyptic number.

It is an amenable number.

628820 is an abundant number, since it is smaller than the sum of its proper divisors (750124).

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

628820 is a wasteful number, since it uses less digits than its factorization.

628820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399 (or 1397 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 628820 is about 792.9817147955. The cubic root of 628820 is about 85.6726332016.

The spelling of 628820 in words is "six hundred twenty-eight thousand, eight hundred twenty".