391728888 has 48 divisors (see below), whose sum is σ = 1066829400. Its totient is φ = 129850560.

The previous prime is 391728863. The next prime is 391728889. The reversal of 391728888 is 888827193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391728889) 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 11 ways as a sum of consecutive naturals, for example, 1998 + ... + 28061.

Almost surely, 2^391728888 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 391728888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (533414700).

391728888 is an abundant number, since it is smaller than the sum of its proper divisors (675100512).

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

391728888 is a wasteful number, since it uses less digits than its factorization.

391728888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30252 (or 30245 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The square root of 391728888 is about 19792.1420770972. The cubic root of 391728888 is about 731.6923817173.

The spelling of 391728888 in words is "three hundred ninety-one million, seven hundred twenty-eight thousand, eight hundred eighty-eight".