19890028 has 6 divisors (see below), whose sum is σ = 34807556. Its totient is φ = 9945012.

The previous prime is 19890019. The next prime is 19890029. The reversal of 19890028 is 82009891.

It is a super-2 number, since 2×19890028² = 791226427681568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19890029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2486250 + ... + 2486257.

Almost surely, 2^19890028 is an apocalyptic number.

It is an amenable number.

19890028 is a deficient number, since it is larger than the sum of its proper divisors (14917528).

19890028 is a wasteful number, since it uses less digits than its factorization.

19890028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4972511 (or 4972509 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 19890028 is about 4459.8237633342. The cubic root of 19890028 is about 270.9433304252.

The spelling of 19890028 in words is "nineteen million, eight hundred ninety thousand, twenty-eight".