188728007 has 8 divisors (see below), whose sum is σ = 213942960. Its totient is φ = 165041280.

The previous prime is 188728003. The next prime is 188728013. The reversal of 188728007 is 700827881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 188728007 - 2² = 188728003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188728003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381794 + ... + 382287.

It is an arithmetic number, because the mean of its divisors is an integer number (26742870).

Almost surely, 2^188728007 is an apocalyptic number.

188728007 is a deficient number, since it is larger than the sum of its proper divisors (25214953).

188728007 is a wasteful number, since it uses less digits than its factorization.

188728007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764113.

The product of its (nonzero) digits is 50176, while the sum is 41.

The square root of 188728007 is about 13737.8312334953. The cubic root of 188728007 is about 573.6039296023.

The spelling of 188728007 in words is "one hundred eighty-eight million, seven hundred twenty-eight thousand, seven".