28708049 has 4 divisors (see below), whose sum is σ = 28884336. Its totient is φ = 28531764.

The previous prime is 28708039. The next prime is 28708051. The reversal of 28708049 is 94080782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28708049 - 2¹² = 28703953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28708039) 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, 87899 + ... + 88224.

It is an arithmetic number, because the mean of its divisors is an integer number (7221084).

Almost surely, 2^28708049 is an apocalyptic number.

It is an amenable number.

28708049 is a deficient number, since it is larger than the sum of its proper divisors (176287).

28708049 is a wasteful number, since it uses less digits than its factorization.

28708049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176286.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28708049 is about 5357.9892683730. The cubic root of 28708049 is about 306.1972079486.

The spelling of 28708049 in words is "twenty-eight million, seven hundred eight thousand, forty-nine".