628990864 has 20 divisors (see below), whose sum is σ = 1223208540. Its totient is φ = 313324160.

The previous prime is 628990853. The next prime is 628990897. The reversal of 628990864 is 468099826.

628990864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 313573264 + 315417600 = 17708^2 + 17760^2 .

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, 68767 + ... + 77374.

It is an arithmetic number, because the mean of its divisors is an integer number (61160427).

Almost surely, 2^628990864 is an apocalyptic number.

It is an amenable number.

628990864 is a deficient number, since it is larger than the sum of its proper divisors (594217676).

628990864 is a wasteful number, since it uses less digits than its factorization.

628990864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146418 (or 146412 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 52.

The square root of 628990864 is about 25079.6902692198. The cubic root of 628990864 is about 856.8039220156.

The spelling of 628990864 in words is "six hundred twenty-eight million, nine hundred ninety thousand, eight hundred sixty-four".