163888890 has 64 divisors (see below), whose sum is σ = 439592832. Its totient is φ = 38758400.

The previous prime is 163888877. The next prime is 163888913. The reversal of 163888890 is 98888361.

It is a happy number.

163888890 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 7474 + ... + 19586.

It is an arithmetic number, because the mean of its divisors is an integer number (6868638).

Almost surely, 2^163888890 is an apocalyptic number.

163888890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 163888890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219796416).

163888890 is an abundant number, since it is smaller than the sum of its proper divisors (275703942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163888890 is a wasteful number, since it uses less digits than its factorization.

163888890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12175.

The product of its (nonzero) digits is 663552, while the sum is 51.

The square root of 163888890 is about 12801.9096231773. The cubic root of 163888890 is about 547.2467250784.

The spelling of 163888890 in words is "one hundred sixty-three million, eight hundred eighty-eight thousand, eight hundred ninety".