188428864 has 56 divisors (see below), whose sum is σ = 413626808. Its totient is φ = 84602880.

The previous prime is 188428861. The next prime is 188428873. The reversal of 188428864 is 468824881.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7795264 + 180633600 = 2792^2 + 13440^2 .

It is not an unprimeable number, because it can be changed into a prime (188428861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27724 + ... + 33844.

It is an arithmetic number, because the mean of its divisors is an integer number (7386193).

Almost surely, 2^188428864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 188428864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206813404).

188428864 is an abundant number, since it is smaller than the sum of its proper divisors (225197944).

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

188428864 is a wasteful number, since it uses less digits than its factorization.

188428864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6183 (or 6173 counting only the distinct ones).

The product of its digits is 786432, while the sum is 49.

The square root of 188428864 is about 13726.9393529658. The cubic root of 188428864 is about 573.3007060334.

The spelling of 188428864 in words is "one hundred eighty-eight million, four hundred twenty-eight thousand, eight hundred sixty-four".