990928 has 10 divisors (see below), whose sum is σ = 1919954. Its totient is φ = 495456.

The previous prime is 990923. The next prime is 990953. The reversal of 990928 is 829099.

It can be written as a sum of positive squares in only one way, i.e., 824464 + 166464 = 908^2 + 408^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990923) 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, 30951 + ... + 30982.

2⁹⁹⁰⁹²⁸ is an apocalyptic number.

It is an amenable number.

990928 is a deficient number, since it is larger than the sum of its proper divisors (929026).

990928 is a wasteful number, since it uses less digits than its factorization.

990928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61941 (or 61935 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 990928 is about 995.4536654209. The cubic root of 990928 is about 99.6966809055.

The spelling of 990928 in words is "nine hundred ninety thousand, nine hundred twenty-eight".