390745728 has 64 divisors (see below), whose sum is σ = 1153252800. Its totient is φ = 130247424.

The previous prime is 390745727. The next prime is 390745753. The reversal of 390745728 is 827547093.

390745728 is a `hidden beast` number, since 3 + 9 + 0 + 74 + 572 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (390745727) 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, 53076 + ... + 59987.

It is an arithmetic number, because the mean of its divisors is an integer number (18019575).

Almost surely, 2^390745728 is an apocalyptic number.

It is an amenable number.

390745728 is an abundant number, since it is smaller than the sum of its proper divisors (762507072).

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

390745728 is a wasteful number, since it uses less digits than its factorization.

390745728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113086 (or 113068 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 390745728 is about 19767.2893437618. The cubic root of 390745728 is about 731.0797357697.

The spelling of 390745728 in words is "three hundred ninety million, seven hundred forty-five thousand, seven hundred twenty-eight".