28838539 has 4 divisors (see below), whose sum is σ = 29541960. Its totient is φ = 28135120.

The previous prime is 28838531. The next prime is 28838569. The reversal of 28838539 is 93583882.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28838539 - 2³ = 28838531 is a prime.

It is a super-2 number, since 2×28838539² = 1663322663309042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28838531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351649 + ... + 351730.

It is an arithmetic number, because the mean of its divisors is an integer number (7385490).

Almost surely, 2^28838539 is an apocalyptic number.

28838539 is a deficient number, since it is larger than the sum of its proper divisors (703421).

28838539 is an equidigital number, since it uses as much as digits as its factorization.

28838539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703420.

The product of its digits is 414720, while the sum is 46.

The square root of 28838539 is about 5370.1526049080. The cubic root of 28838539 is about 306.6604379380.

The spelling of 28838539 in words is "twenty-eight million, eight hundred thirty-eight thousand, five hundred thirty-nine".