28320337 has 4 divisors (see below), whose sum is σ = 29551680. Its totient is φ = 27088996.

The previous prime is 28320323. The next prime is 28320343. The reversal of 28320337 is 73302382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28320337 - 2¹⁵ = 28287569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28320307) 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, 615637 + ... + 615682.

It is an arithmetic number, because the mean of its divisors is an integer number (7387920).

Almost surely, 2^28320337 is an apocalyptic number.

It is an amenable number.

28320337 is a deficient number, since it is larger than the sum of its proper divisors (1231343).

28320337 is a wasteful number, since it uses less digits than its factorization.

28320337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231342.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 28320337 is about 5321.6855412548. The cubic root of 28320337 is about 304.8125229652.

The spelling of 28320337 in words is "twenty-eight million, three hundred twenty thousand, three hundred thirty-seven".