28839539 has 8 divisors (see below), whose sum is σ = 30907680. Its totient is φ = 26839296.

The previous prime is 28839533. The next prime is 28839553. The reversal of 28839539 is 93593882.

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 28839539 - 2²⁰ = 27790963 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28839493 and 28839502.

It is not an unprimeable number, because it can be changed into a prime (28839533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16094 + ... + 17795.

It is an arithmetic number, because the mean of its divisors is an integer number (3863460).

Almost surely, 2^28839539 is an apocalyptic number.

28839539 is a deficient number, since it is larger than the sum of its proper divisors (2068141).

28839539 is a wasteful number, since it uses less digits than its factorization.

28839539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33949.

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

The square root of 28839539 is about 5370.2457113246. The cubic root of 28839539 is about 306.6639824644.

The spelling of 28839539 in words is "twenty-eight million, eight hundred thirty-nine thousand, five hundred thirty-nine".