28275239 has 2 divisors, whose sum is σ = 28275240. Its totient is φ = 28275238.

The previous prime is 28275227. The next prime is 28275307. The reversal of 28275239 is 93257282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28275239 - 2⁴ = 28275223 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28275739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14137619 + 14137620.

It is an arithmetic number, because the mean of its divisors is an integer number (14137620).

Almost surely, 2^28275239 is an apocalyptic number.

28275239 is a deficient number, since it is larger than the sum of its proper divisors (1).

28275239 is an equidigital number, since it uses as much as digits as its factorization.

28275239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 28275239 is about 5317.4466616977. The cubic root of 28275239 is about 304.6506400240.

The spelling of 28275239 in words is "twenty-eight million, two hundred seventy-five thousand, two hundred thirty-nine".