28739249 has 16 divisors (see below), whose sum is σ = 35997696. Its totient is φ = 22290000.

The previous prime is 28739239. The next prime is 28739273. The reversal of 28739249 is 94293782.

28739249 is nontrivially palindromic in base 16.

It is a cyclic number.

It is not a de Polignac number, because 28739249 - 2⁴ = 28739233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28739209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18584 + ... + 20070.

It is an arithmetic number, because the mean of its divisors is an integer number (2249856).

Almost surely, 2^28739249 is an apocalyptic number.

It is an amenable number.

28739249 is a deficient number, since it is larger than the sum of its proper divisors (7258447).

28739249 is a wasteful number, since it uses less digits than its factorization.

28739249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756.

The product of its digits is 217728, while the sum is 44.

The square root of 28739249 is about 5360.9000177209. The cubic root of 28739249 is about 306.3080931583.

The spelling of 28739249 in words is "twenty-eight million, seven hundred thirty-nine thousand, two hundred forty-nine".