28539839 has 8 divisors (see below), whose sum is σ = 29379168. Its totient is φ = 27704160.

The previous prime is 28539781. The next prime is 28539853. The reversal of 28539839 is 93893582.

28539839 = T₃₉₂ + T₃₉₃ + ... + T₆₁₃.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28539839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28539793 and 28539802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28530839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26369 + ... + 27429.

It is an arithmetic number, because the mean of its divisors is an integer number (3672396).

Almost surely, 2^28539839 is an apocalyptic number.

28539839 is a deficient number, since it is larger than the sum of its proper divisors (839329).

28539839 is a wasteful number, since it uses less digits than its factorization.

28539839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825.

The product of its digits is 466560, while the sum is 47.

The square root of 28539839 is about 5342.2690871951. The cubic root of 28539839 is about 305.5979990309.

The spelling of 28539839 in words is "twenty-eight million, five hundred thirty-nine thousand, eight hundred thirty-nine".