188668890 has 96 divisors (see below), whose sum is σ = 522372240. Its totient is φ = 47081472.

The previous prime is 188668889. The next prime is 188668897. The reversal of 188668890 is 98866881.

It can be written as a sum of positive squares in 8 ways, for example, as 35676729 + 152992161 = 5973^2 + 12369^2 .

It is not an unprimeable number, because it can be changed into a prime (188668897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 484816 + ... + 485204.

Almost surely, 2^188668890 is an apocalyptic number.

188668890 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 188668890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261186120).

188668890 is an abundant number, since it is smaller than the sum of its proper divisors (333703350).

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

188668890 is a wasteful number, since it uses less digits than its factorization.

188668890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736 (or 733 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 54.

The square root of 188668890 is about 13735.6794517053. The cubic root of 188668890 is about 573.5440316125.

The spelling of 188668890 in words is "one hundred eighty-eight million, six hundred sixty-eight thousand, eight hundred ninety".