28684839 has 8 divisors (see below), whose sum is σ = 38770672. Its totient is φ = 18861120.

The previous prime is 28684837. The next prime is 28684847. The reversal of 28684839 is 93848682.

It is a happy number.

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

It is not a de Polignac number, because 28684839 - 2¹ = 28684837 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 (28684837) 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, 65272 + ... + 65709.

It is an arithmetic number, because the mean of its divisors is an integer number (4846334).

Almost surely, 2^28684839 is an apocalyptic number.

28684839 is a deficient number, since it is larger than the sum of its proper divisors (10085833).

28684839 is a wasteful number, since it uses less digits than its factorization.

28684839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131057.

The product of its digits is 663552, while the sum is 48.

The square root of 28684839 is about 5355.8229059595. The cubic root of 28684839 is about 306.1146671797.

The spelling of 28684839 in words is "twenty-eight million, six hundred eighty-four thousand, eight hundred thirty-nine".