388775028 has 24 divisors (see below), whose sum is σ = 909201888. Its totient is φ = 129297376.

The previous prime is 388775027. The next prime is 388775029. The reversal of 388775028 is 820577883.

It is an interprime number because it is at equal distance from previous prime (388775027) and next prime (388775029).

It is a super-2 number, since 2×388775028² = 302292044792801568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388775027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31251 + ... + 41882.

It is an arithmetic number, because the mean of its divisors is an integer number (37883412).

Almost surely, 2^388775028 is an apocalyptic number.

It is an amenable number.

388775028 is an abundant number, since it is smaller than the sum of its proper divisors (520426860).

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

388775028 is a wasteful number, since it uses less digits than its factorization.

388775028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73583 (or 73581 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 48.

The square root of 388775028 is about 19717.3788318833. The cubic root of 388775028 is about 729.8486131313.

The spelling of 388775028 in words is "three hundred eighty-eight million, seven hundred seventy-five thousand, twenty-eight".