188868880 has 40 divisors (see below), whose sum is σ = 454267800. Its totient is φ = 72941568.

The previous prime is 188868877. The next prime is 188868881. The reversal of 188868880 is 88868881.

It can be written as a sum of positive squares in 4 ways, for example, as 12616704 + 176252176 = 3552^2 + 13276^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (188868881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38385 + ... + 43024.

It is an arithmetic number, because the mean of its divisors is an integer number (11356695).

Almost surely, 2^188868880 is an apocalyptic number.

188868880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188868880 is an abundant number, since it is smaller than the sum of its proper divisors (265398920).

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

188868880 is a wasteful number, since it uses less digits than its factorization.

188868880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81451 (or 81445 counting only the distinct ones).

The product of its (nonzero) digits is 1572864, while the sum is 55.

The square root of 188868880 is about 13742.9574691913. The cubic root of 188868880 is about 573.7466132642.

Subtracting from 188868880 its reverse (88868881), we obtain a palindrome (99999999).

The spelling of 188868880 in words is "one hundred eighty-eight million, eight hundred sixty-eight thousand, eight hundred eighty".