28320338 has 18 divisors (see below), whose sum is σ = 43915557. Its totient is φ = 13697320.

The previous prime is 28320323. The next prime is 28320343. The reversal of 28320338 is 83302382.

It can be written as a sum of positive squares in 2 ways, for example, as 26863489 + 1456849 = 5183^2 + 1207^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3763.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28320338.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 398843 + ... + 398913.

Almost surely, 2^28320338 is an apocalyptic number.

28320338 is a deficient number, since it is larger than the sum of its proper divisors (15595219).

28320338 is an frugal number, since it uses more digits than its factorization.

28320338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 28320338 is about 5321.6856352100. The cubic root of 28320338 is about 304.8125265528.

The spelling of 28320338 in words is "twenty-eight million, three hundred twenty thousand, three hundred thirty-eight".