388728516 has 24 divisors (see below), whose sum is σ = 989491104. Its totient is φ = 117796480.

The previous prime is 388728491. The next prime is 388728523. The reversal of 388728516 is 615827883.

It is a super-2 number, since 2×388728516² = 302219718303124512, which contains 22 as substring.

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, 1472325 + ... + 1472588.

It is an arithmetic number, because the mean of its divisors is an integer number (41228796).

Almost surely, 2^388728516 is an apocalyptic number.

It is an amenable number.

388728516 is an abundant number, since it is smaller than the sum of its proper divisors (600762588).

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

388728516 is a wasteful number, since it uses less digits than its factorization.

388728516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944931 (or 2944929 counting only the distinct ones).

The product of its digits is 645120, while the sum is 48.

The square root of 388728516 is about 19716.1993294854. The cubic root of 388728516 is about 729.8195062614.

The spelling of 388728516 in words is "three hundred eighty-eight million, seven hundred twenty-eight thousand, five hundred sixteen".