163188090 has 72 divisors (see below), whose sum is σ = 459480060. Its totient is φ = 40165632.

The previous prime is 163188073. The next prime is 163188097. The reversal of 163188090 is 90881361.

It can be written as a sum of positive squares in 6 ways, for example, as 31236921 + 131951169 = 5589^2 + 11487^2 .

It is not an unprimeable number, because it can be changed into a prime (163188097) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9846 + ... + 20574.

Almost surely, 2^163188090 is an apocalyptic number.

163188090 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 163188090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229740030).

163188090 is an abundant number, since it is smaller than the sum of its proper divisors (296291970).

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

163188090 is a wasteful number, since it uses less digits than its factorization.

163188090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10768 (or 10752 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 163188090 is about 12774.5093839255. The cubic root of 163188090 is about 546.4655892609.

The spelling of 163188090 in words is "one hundred sixty-three million, one hundred eighty-eight thousand, ninety".