28955239 has 4 divisors (see below), whose sum is σ = 28970800. Its totient is φ = 28939680.

The previous prime is 28955203. The next prime is 28955249. The reversal of 28955239 is 93255982.

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 28955239 - 2¹¹ = 28953191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28955195 and 28955204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28955249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4539 + ... + 8860.

It is an arithmetic number, because the mean of its divisors is an integer number (7242700).

Almost surely, 2^28955239 is an apocalyptic number.

28955239 is a deficient number, since it is larger than the sum of its proper divisors (15561).

28955239 is a wasteful number, since it uses less digits than its factorization.

28955239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15560.

The product of its digits is 194400, while the sum is 43.

The square root of 28955239 is about 5381.0072477186. The cubic root of 28955239 is about 307.0735322382.

The spelling of 28955239 in words is "twenty-eight million, nine hundred fifty-five thousand, two hundred thirty-nine".