28604239 has 2 divisors, whose sum is σ = 28604240. Its totient is φ = 28604238.

The previous prime is 28604231. The next prime is 28604263. The reversal of 28604239 is 93240682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28604239 - 2³ = 28604231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28604231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14302119 + 14302120.

It is an arithmetic number, because the mean of its divisors is an integer number (14302120).

Almost surely, 2^28604239 is an apocalyptic number.

28604239 is a deficient number, since it is larger than the sum of its proper divisors (1).

28604239 is an equidigital number, since it uses as much as digits as its factorization.

28604239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 28604239 is about 5348.2930921931. The cubic root of 28604239 is about 305.8276864593.

The spelling of 28604239 in words is "twenty-eight million, six hundred four thousand, two hundred thirty-nine".