28539438 has 16 divisors (see below), whose sum is σ = 57351936. Its totient is φ = 9467640.

The previous prime is 28539431. The next prime is 28539449. The reversal of 28539438 is 83493582.

It is a self number, because there is not a number n which added to its sum of digits gives 28539438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28539431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10006 + ... + 12537.

It is an arithmetic number, because the mean of its divisors is an integer number (3584496).

Almost surely, 2^28539438 is an apocalyptic number.

28539438 is an abundant number, since it is smaller than the sum of its proper divisors (28812498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28539438 is a wasteful number, since it uses less digits than its factorization.

28539438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22759.

The product of its digits is 207360, while the sum is 42.

The square root of 28539438 is about 5342.2315561945. The cubic root of 28539438 is about 305.5965677524.

The spelling of 28539438 in words is "twenty-eight million, five hundred thirty-nine thousand, four hundred thirty-eight".