28789039 has 4 divisors (see below), whose sum is σ = 28834456. Its totient is φ = 28743624.

The previous prime is 28789037. The next prime is 28789063. The reversal of 28789039 is 93098782.

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 28789039 - 2¹ = 28789037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28789039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28789037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21744 + ... + 23029.

It is an arithmetic number, because the mean of its divisors is an integer number (7208614).

Almost surely, 2^28789039 is an apocalyptic number.

28789039 is a deficient number, since it is larger than the sum of its proper divisors (45417).

28789039 is an equidigital number, since it uses as much as digits as its factorization.

28789039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45416.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 28789039 is about 5365.5418179341. The cubic root of 28789039 is about 306.4848813671.

The spelling of 28789039 in words is "twenty-eight million, seven hundred eighty-nine thousand, thirty-nine".