28086439 has 8 divisors (see below), whose sum is σ = 28827920. Its totient is φ = 27349056.

The previous prime is 28086433. The next prime is 28086451. The reversal of 28086439 is 93468082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28086439 - 2²³ = 19697831 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 (28086433) 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, 16789 + ... + 18385.

It is an arithmetic number, because the mean of its divisors is an integer number (3603490).

Almost surely, 2^28086439 is an apocalyptic number.

28086439 is a deficient number, since it is larger than the sum of its proper divisors (741481).

28086439 is a wasteful number, since it uses less digits than its factorization.

28086439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2049.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 28086439 is about 5299.6640459561. The cubic root of 28086439 is about 303.9710520393.

The spelling of 28086439 in words is "twenty-eight million, eighty-six thousand, four hundred thirty-nine".