28732839 has 16 divisors (see below), whose sum is σ = 41430528. Its totient is φ = 17643392.

The previous prime is 28732813. The next prime is 28732843. The reversal of 28732839 is 93823782.

It is a cyclic number.

It is not a de Polignac number, because 28732839 - 2¹⁷ = 28601767 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28732839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28732889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3597 + ... + 8390.

It is an arithmetic number, because the mean of its divisors is an integer number (2589408).

Almost surely, 2^28732839 is an apocalyptic number.

28732839 is a deficient number, since it is larger than the sum of its proper divisors (12697689).

28732839 is a wasteful number, since it uses less digits than its factorization.

28732839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12054.

The product of its digits is 145152, while the sum is 42.

The square root of 28732839 is about 5360.3021370068. The cubic root of 28732839 is about 306.2853184868.

The spelling of 28732839 in words is "twenty-eight million, seven hundred thirty-two thousand, eight hundred thirty-nine".