188678728 has 64 divisors (see below), whose sum is σ = 415653120. Its totient is φ = 78624000.

The previous prime is 188678723. The next prime is 188678747. The reversal of 188678728 is 827876881.

It is not an unprimeable number, because it can be changed into a prime (188678723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 447958 + ... + 448378.

It is an arithmetic number, because the mean of its divisors is an integer number (6494580).

Almost surely, 2^188678728 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 188678728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207826560).

188678728 is an abundant number, since it is smaller than the sum of its proper divisors (226974392).

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

188678728 is a wasteful number, since it uses less digits than its factorization.

188678728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638 (or 634 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 55.

The square root of 188678728 is about 13736.0375654699. The cubic root of 188678728 is about 573.5540004493.

The spelling of 188678728 in words is "one hundred eighty-eight million, six hundred seventy-eight thousand, seven hundred twenty-eight".