990028 has 24 divisors (see below), whose sum is σ = 1897280. Its totient is φ = 449280.

The previous prime is 990023. The next prime is 990037. The reversal of 990028 is 820099.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 989978 and 990005.

It is not an unprimeable number, because it can be changed into a prime (990023) 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 in 7 ways as a sum of consecutive naturals, for example, 3988 + ... + 4228.

2⁹⁹⁰⁰²⁸ is an apocalyptic number.

It is an amenable number.

990028 is a deficient number, since it is larger than the sum of its proper divisors (907252).

990028 is a wasteful number, since it uses less digits than its factorization.

990028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 990028 is about 995.0015075365. The cubic root of 990028 is about 99.6664889403. Note that the first 3 decimals are identical.

The spelling of 990028 in words is "nine hundred ninety thousand, twenty-eight".