28787339 has 16 divisors (see below), whose sum is σ = 34256640. Its totient is φ = 23677920.

The previous prime is 28787327. The next prime is 28787347. The reversal of 28787339 is 93378782.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-28787339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28787293 and 28787302.

It is not an unprimeable number, because it can be changed into a prime (28787309) 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, 16949 + ... + 18569.

It is an arithmetic number, because the mean of its divisors is an integer number (2141040).

Almost surely, 2^28787339 is an apocalyptic number.

28787339 is a deficient number, since it is larger than the sum of its proper divisors (5469301).

28787339 is a wasteful number, since it uses less digits than its factorization.

28787339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730.

The product of its digits is 508032, while the sum is 47.

The square root of 28787339 is about 5365.3833972979. The cubic root of 28787339 is about 306.4788485786.

The spelling of 28787339 in words is "twenty-eight million, seven hundred eighty-seven thousand, three hundred thirty-nine".