28118239 has 2 divisors, whose sum is σ = 28118240. Its totient is φ = 28118238.

The previous prime is 28118227. The next prime is 28118243. The reversal of 28118239 is 93281182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28118239 - 2²¹ = 26021087 is a prime.

It is a super-2 number, since 2×28118239² = 1581270728922242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28118219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14059119 + 14059120.

It is an arithmetic number, because the mean of its divisors is an integer number (14059120).

Almost surely, 2^28118239 is an apocalyptic number.

28118239 is a deficient number, since it is larger than the sum of its proper divisors (1).

28118239 is an equidigital number, since it uses as much as digits as its factorization.

28118239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 34.

The square root of 28118239 is about 5302.6633873932. The cubic root of 28118239 is about 304.0857293708.

The spelling of 28118239 in words is "twenty-eight million, one hundred eighteen thousand, two hundred thirty-nine".