28906039 has 4 divisors (see below), whose sum is σ = 28917760. Its totient is φ = 28894320.

The previous prime is 28906027. The next prime is 28906057. The reversal of 28906039 is 93060982.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28906039 - 2⁷ = 28905911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28905989 and 28906007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28906079) 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 3 ways as a sum of consecutive naturals, for example, 567 + ... + 7624.

It is an arithmetic number, because the mean of its divisors is an integer number (7229440).

Almost surely, 2^28906039 is an apocalyptic number.

28906039 is a deficient number, since it is larger than the sum of its proper divisors (11721).

28906039 is an equidigital number, since it uses as much as digits as its factorization.

28906039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11720.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 28906039 is about 5376.4336692644. The cubic root of 28906039 is about 306.8995098109.

The spelling of 28906039 in words is "twenty-eight million, nine hundred six thousand, thirty-nine".