28339539 has 4 divisors (see below), whose sum is σ = 37786056. Its totient is φ = 18893024.

The previous prime is 28339513. The next prime is 28339559. The reversal of 28339539 is 93593382.

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 28339539 - 2¹⁶ = 28274003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28339539.

It is not an unprimeable number, because it can be changed into a prime (28339559) 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 3 ways as a sum of consecutive naturals, for example, 4723254 + ... + 4723259.

It is an arithmetic number, because the mean of its divisors is an integer number (9446514).

Almost surely, 2^28339539 is an apocalyptic number.

28339539 is a deficient number, since it is larger than the sum of its proper divisors (9446517).

28339539 is an equidigital number, since it uses as much as digits as its factorization.

28339539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9446516.

The product of its digits is 174960, while the sum is 42.

The square root of 28339539 is about 5323.4893631903. The cubic root of 28339539 is about 304.8813979427.

The spelling of 28339539 in words is "twenty-eight million, three hundred thirty-nine thousand, five hundred thirty-nine".