28163439 has 6 divisors (see below), whose sum is σ = 40680536. Its totient is φ = 18775620.

The previous prime is 28163417. The next prime is 28163449. The reversal of 28163439 is 93436182.

It is not a de Polignac number, because 28163439 - 2¹⁹ = 27639151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28163449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1564627 + ... + 1564644.

Almost surely, 2^28163439 is an apocalyptic number.

28163439 is a deficient number, since it is larger than the sum of its proper divisors (12517097).

28163439 is a wasteful number, since it uses less digits than its factorization.

28163439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3129277 (or 3129274 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 28163439 is about 5306.9236851494. The cubic root of 28163439 is about 304.2485811612.

The spelling of 28163439 in words is "twenty-eight million, one hundred sixty-three thousand, four hundred thirty-nine".