28068239 has 4 divisors (see below), whose sum is σ = 28090056. Its totient is φ = 28046424.

The previous prime is 28068199. The next prime is 28068253. The reversal of 28068239 is 93286082.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28068239 - 2⁸ = 28067983 is a prime.

It is a super-2 number, since 2×28068239² = 1575652081122242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28068269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8849 + ... + 11594.

It is an arithmetic number, because the mean of its divisors is an integer number (7022514).

Almost surely, 2^28068239 is an apocalyptic number.

28068239 is a deficient number, since it is larger than the sum of its proper divisors (21817).

28068239 is a wasteful number, since it uses less digits than its factorization.

28068239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21816.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 28068239 is about 5297.9466777234. The cubic root of 28068239 is about 303.9053801499.

The spelling of 28068239 in words is "twenty-eight million, sixty-eight thousand, two hundred thirty-nine".