191232728 has 32 divisors (see below), whose sum is σ = 392752800. Its totient is φ = 86886912.

The previous prime is 191232721. The next prime is 191232731. The reversal of 191232728 is 827232191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191232721) 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, 20300 + ... + 28187.

It is an arithmetic number, because the mean of its divisors is an integer number (12273525).

Almost surely, 2^191232728 is an apocalyptic number.

It is an amenable number.

191232728 is an abundant number, since it is smaller than the sum of its proper divisors (201520072).

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

191232728 is a wasteful number, since it uses less digits than its factorization.

191232728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48539 (or 48535 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 191232728 is about 13828.6922013616. The cubic root of 191232728 is about 576.1303315545.

The spelling of 191232728 in words is "one hundred ninety-one million, two hundred thirty-two thousand, seven hundred twenty-eight".