28039349 has 4 divisors (see below), whose sum is σ = 30196236. Its totient is φ = 25882464.

The previous prime is 28039343. The next prime is 28039387. The reversal of 28039349 is 94393082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18645124 + 9394225 = 4318^2 + 3065^2 .

It is a cyclic number.

It is not a de Polignac number, because 28039349 - 2²⁴ = 11262133 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 (28039343) 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, 1078424 + ... + 1078449.

It is an arithmetic number, because the mean of its divisors is an integer number (7549059).

Almost surely, 2^28039349 is an apocalyptic number.

It is an amenable number.

28039349 is a deficient number, since it is larger than the sum of its proper divisors (2156887).

28039349 is a wasteful number, since it uses less digits than its factorization.

28039349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2156886.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 28039349 is about 5295.2194477661. The cubic root of 28039349 is about 303.8010767241.

The spelling of 28039349 in words is "twenty-eight million, thirty-nine thousand, three hundred forty-nine".