28009339 has 4 divisors (see below), whose sum is σ = 28036800. Its totient is φ = 27981880.

The previous prime is 28009327. The next prime is 28009343. The reversal of 28009339 is 93390082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93390082 = 2 ⋅46695041.

It is a cyclic number.

It is not a de Polignac number, because 28009339 - 2⁵ = 28009307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28009139) 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, 12139 + ... + 14260.

It is an arithmetic number, because the mean of its divisors is an integer number (7009200).

Almost surely, 2^28009339 is an apocalyptic number.

28009339 is a deficient number, since it is larger than the sum of its proper divisors (27461).

28009339 is a wasteful number, since it uses less digits than its factorization.

28009339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27460.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 28009339 is about 5292.3850011124. The cubic root of 28009339 is about 303.6926537972.

The spelling of 28009339 in words is "twenty-eight million, nine thousand, three hundred thirty-nine".