28712439 has 72 divisors (see below), whose sum is σ = 53639040. Its totient is φ = 14452992.

The previous prime is 28712419. The next prime is 28712443. The reversal of 28712439 is 93421782.

It is not a de Polignac number, because 28712439 - 2⁷ = 28712311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28712419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 345892 + ... + 345974.

Almost surely, 2^28712439 is an apocalyptic number.

28712439 is a deficient number, since it is larger than the sum of its proper divisors (24926601).

28712439 is a wasteful number, since it uses less digits than its factorization.

28712439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 129 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 28712439 is about 5358.3989213197. The cubic root of 28712439 is about 306.2128149215.

The spelling of 28712439 in words is "twenty-eight million, seven hundred twelve thousand, four hundred thirty-nine".