28539842 has 4 divisors (see below), whose sum is σ = 42809766. Its totient is φ = 14269920.

The previous prime is 28539781. The next prime is 28539853. The reversal of 28539842 is 24893582.

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

It can be written as a sum of positive squares in only one way, i.e., 27237961 + 1301881 = 5219^2 + 1141^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28539842.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7134959 + ... + 7134962.

Almost surely, 2^28539842 is an apocalyptic number.

28539842 is a deficient number, since it is larger than the sum of its proper divisors (14269924).

28539842 is a wasteful number, since it uses less digits than its factorization.

28539842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14269923.

The product of its digits is 138240, while the sum is 41.

The square root of 28539842 is about 5342.2693679746. The cubic root of 28539842 is about 305.5980097387.

The spelling of 28539842 in words is "twenty-eight million, five hundred thirty-nine thousand, eight hundred forty-two".