163890028 has 24 divisors (see below), whose sum is σ = 294674688. Its totient is φ = 79712976.

The previous prime is 163890011. The next prime is 163890043. The reversal of 163890028 is 820098361.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43425 + ... + 47047.

It is an arithmetic number, because the mean of its divisors is an integer number (12278112).

Almost surely, 2^163890028 is an apocalyptic number.

It is an amenable number.

163890028 is a deficient number, since it is larger than the sum of its proper divisors (130784660).

163890028 is a wasteful number, since it uses less digits than its factorization.

163890028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933 (or 3931 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 163890028 is about 12801.9540695942. The cubic root of 163890028 is about 547.2479917197.

The spelling of 163890028 in words is "one hundred sixty-three million, eight hundred ninety thousand, twenty-eight".