28806239 has 16 divisors (see below), whose sum is σ = 36888576. Its totient is φ = 21837600.

The previous prime is 28806233. The next prime is 28806247. The reversal of 28806239 is 93260882.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28806239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28806233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2207 + ... + 7904.

It is an arithmetic number, because the mean of its divisors is an integer number (2305536).

Almost surely, 2^28806239 is an apocalyptic number.

28806239 is a deficient number, since it is larger than the sum of its proper divisors (8082337).

28806239 is a wasteful number, since it uses less digits than its factorization.

28806239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10166.

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

The square root of 28806239 is about 5367.1443990264. The cubic root of 28806239 is about 306.5459056396.

It can be divided in two parts, 2880 and 6239, that added together give a palindrome (9119).

The spelling of 28806239 in words is "twenty-eight million, eight hundred six thousand, two hundred thirty-nine".