28159439 has 32 divisors (see below), whose sum is σ = 37158912. Its totient is φ = 20700000.

The previous prime is 28159433. The next prime is 28159441. The reversal of 28159439 is 93495182.

It is a cyclic number.

It is not a de Polignac number, because 28159439 - 2¹⁶ = 28093903 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28159396 and 28159405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28159433) 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 31 ways as a sum of consecutive naturals, for example, 112064 + ... + 112314.

It is an arithmetic number, because the mean of its divisors is an integer number (1161216).

Almost surely, 2^28159439 is an apocalyptic number.

28159439 is a deficient number, since it is larger than the sum of its proper divisors (8999473).

28159439 is a wasteful number, since it uses less digits than its factorization.

28159439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347.

The product of its digits is 77760, while the sum is 41.

The square root of 28159439 is about 5306.5468055978. The cubic root of 28159439 is about 304.2341765290.

The spelling of 28159439 in words is "twenty-eight million, one hundred fifty-nine thousand, four hundred thirty-nine".