388306728 has 48 divisors (see below), whose sum is σ = 1053105300. Its totient is φ = 129258240.

The previous prime is 388306717. The next prime is 388306757. The reversal of 388306728 is 827603883.

It can be written as a sum of positive squares in 2 ways, for example, as 383298084 + 5008644 = 19578^2 + 2238^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55828 + ... + 62396.

Almost surely, 2^388306728 is an apocalyptic number.

It is an amenable number.

388306728 is an abundant number, since it is smaller than the sum of its proper divisors (664798572).

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

388306728 is a wasteful number, since it uses less digits than its factorization.

388306728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7402 (or 7395 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 388306728 is about 19705.4999429093. The cubic root of 388306728 is about 729.5554483559. Note that the first 3 decimals are identical.

The spelling of 388306728 in words is "three hundred eighty-eight million, three hundred six thousand, seven hundred twenty-eight".