28179239 has 4 divisors (see below), whose sum is σ = 30741000. Its totient is φ = 25617480.

The previous prime is 28179227. The next prime is 28179289. The reversal of 28179239 is 93297182.

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 28179239 - 2²⁴ = 11402023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28179196 and 28179205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28179289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1280864 + ... + 1280885.

It is an arithmetic number, because the mean of its divisors is an integer number (7685250).

Almost surely, 2^28179239 is an apocalyptic number.

28179239 is a deficient number, since it is larger than the sum of its proper divisors (2561761).

28179239 is a wasteful number, since it uses less digits than its factorization.

28179239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561760.

The product of its digits is 54432, while the sum is 41.

The square root of 28179239 is about 5308.4120977935. The cubic root of 28179239 is about 304.3054661285.

The spelling of 28179239 in words is "twenty-eight million, one hundred seventy-nine thousand, two hundred thirty-nine".