188640328 has 16 divisors (see below), whose sum is σ = 361226880. Its totient is φ = 92313168.

The previous prime is 188640317. The next prime is 188640343. The reversal of 188640328 is 823046881.

188640328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250476 + ... + 251227.

It is an arithmetic number, because the mean of its divisors is an integer number (22576680).

Almost surely, 2^188640328 is an apocalyptic number.

It is an amenable number.

188640328 is a deficient number, since it is larger than the sum of its proper divisors (172586552).

188640328 is a wasteful number, since it uses less digits than its factorization.

188640328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501756 (or 501752 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 188640328 is about 13734.6397113284. The cubic root of 188640328 is about 573.5150877992.

The spelling of 188640328 in words is "one hundred eighty-eight million, six hundred forty thousand, three hundred twenty-eight".