28320392 has 32 divisors (see below), whose sum is σ = 54900120. Its totient is φ = 13685760.

The previous prime is 28320373. The next prime is 28320403. The reversal of 28320392 is 29302382.

It can be written as a sum of positive squares in 4 ways, for example, as 28238596 + 81796 = 5314^2 + 286^2 .

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, 71138 + ... + 71534.

Almost surely, 2^28320392 is an apocalyptic number.

It is an amenable number.

28320392 is a deficient number, since it is larger than the sum of its proper divisors (26579728).

28320392 is a wasteful number, since it uses less digits than its factorization.

28320392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681 (or 677 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 28320392 is about 5321.6907087880. The cubic root of 28320392 is about 304.8127202872.

The spelling of 28320392 in words is "twenty-eight million, three hundred twenty thousand, three hundred ninety-two".