628920328 has 8 divisors (see below), whose sum is σ = 1179225630. Its totient is φ = 314460160.

The previous prime is 628920323. The next prime is 628920337. The reversal of 628920328 is 823029826.

It can be written as a sum of positive squares in only one way, i.e., 514473124 + 114447204 = 22682^2 + 10698^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (628920323) 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 as a sum of consecutive naturals, namely, 39307513 + ... + 39307528.

Almost surely, 2^628920328 is an apocalyptic number.

It is an amenable number.

628920328 is a deficient number, since it is larger than the sum of its proper divisors (550305302).

628920328 is a wasteful number, since it uses less digits than its factorization.

628920328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78615047 (or 78615043 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 628920328 is about 25078.2839923309. The cubic root of 628920328 is about 856.7718930498.

The spelling of 628920328 in words is "six hundred twenty-eight million, nine hundred twenty thousand, three hundred twenty-eight".