163890872 has 16 divisors (see below), whose sum is σ = 311186400. Its totient is φ = 80907840.

The previous prime is 163890841. The next prime is 163890877. The reversal of 163890872 is 278098361.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163890877) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 129029 + ... + 130292.

It is an arithmetic number, because the mean of its divisors is an integer number (19449150).

Almost surely, 2^163890872 is an apocalyptic number.

It is an amenable number.

163890872 is a deficient number, since it is larger than the sum of its proper divisors (147295528).

163890872 is a wasteful number, since it uses less digits than its factorization.

163890872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259406 (or 259402 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 163890872 is about 12801.9870332695. The cubic root of 163890872 is about 547.2489311231.

The spelling of 163890872 in words is "one hundred sixty-three million, eight hundred ninety thousand, eight hundred seventy-two".