28320648 has 16 divisors (see below), whose sum is σ = 70801680. Its totient is φ = 9440208.

The previous prime is 28320647. The next prime is 28320661. The reversal of 28320648 is 84602382.

It is not an unprimeable number, because it can be changed into a prime (28320641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589990 + ... + 590037.

It is an arithmetic number, because the mean of its divisors is an integer number (4425105).

Almost surely, 2^28320648 is an apocalyptic number.

It is an amenable number.

28320648 is an abundant number, since it is smaller than the sum of its proper divisors (42481032).

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

28320648 is a wasteful number, since it uses less digits than its factorization.

28320648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180036 (or 1180032 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 28320648 is about 5321.7147612400. The cubic root of 28320648 is about 304.8136387281.

The spelling of 28320648 in words is "twenty-eight million, three hundred twenty thousand, six hundred forty-eight".