628630928 has 20 divisors (see below), whose sum is σ = 1218558540. Its totient is φ = 314164224.

The previous prime is 628630909. The next prime is 628630931. The reversal of 628630928 is 829036826.

It can be written as a sum of positive squares in 2 ways, for example, as 427331584 + 201299344 = 20672^2 + 14188^2 .

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29768 + ... + 46296.

It is an arithmetic number, because the mean of its divisors is an integer number (60927927).

Almost surely, 2^628630928 is an apocalyptic number.

It is an amenable number.

628630928 is a deficient number, since it is larger than the sum of its proper divisors (589927612).

628630928 is a wasteful number, since it uses less digits than its factorization.

628630928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18914 (or 18908 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 628630928 is about 25072.5133961476. The cubic root of 628630928 is about 856.6404573092.

The spelling of 628630928 in words is "six hundred twenty-eight million, six hundred thirty thousand, nine hundred twenty-eight".