28320490 has 16 divisors (see below), whose sum is σ = 55611360. Its totient is φ = 10298320.

The previous prime is 28320449. The next prime is 28320493. The reversal of 28320490 is 9402382.

It is not an unprimeable number, because it can be changed into a prime (28320493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128620 + ... + 128839.

It is an arithmetic number, because the mean of its divisors is an integer number (3475710).

Almost surely, 2^28320490 is an apocalyptic number.

28320490 is a deficient number, since it is larger than the sum of its proper divisors (27290870).

28320490 is a wasteful number, since it uses less digits than its factorization.

28320490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257477.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 28320490 is about 5321.6999163801. The cubic root of 28320490 is about 304.8130718785.

The spelling of 28320490 in words is "twenty-eight million, three hundred twenty thousand, four hundred ninety".