388764728 has 32 divisors (see below), whose sum is σ = 796815360. Its totient is φ = 176352480.

The previous prime is 388764709. The next prime is 388764731. The reversal of 388764728 is 827467883.

It is a super-2 number, since 2×388764728² = 302276027473827968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 388764728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41801 + ... + 50247.

It is an arithmetic number, because the mean of its divisors is an integer number (24900480).

Almost surely, 2^388764728 is an apocalyptic number.

It is an amenable number.

388764728 is an abundant number, since it is smaller than the sum of its proper divisors (408050632).

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

388764728 is a wasteful number, since it uses less digits than its factorization.

388764728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8987 (or 8983 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 53.

The square root of 388764728 is about 19717.1176392494. The cubic root of 388764728 is about 729.8421676667.

The spelling of 388764728 in words is "three hundred eighty-eight million, seven hundred sixty-four thousand, seven hundred twenty-eight".