28395139 has 4 divisors (see below), whose sum is σ = 29889640. Its totient is φ = 26900640.

The previous prime is 28395131. The next prime is 28395149. The reversal of 28395139 is 93159382.

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 28395139 - 2³ = 28395131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28395131) 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, 747222 + ... + 747259.

It is an arithmetic number, because the mean of its divisors is an integer number (7472410).

Almost surely, 2^28395139 is an apocalyptic number.

28395139 is a deficient number, since it is larger than the sum of its proper divisors (1494501).

28395139 is a wasteful number, since it uses less digits than its factorization.

28395139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494500.

The product of its digits is 58320, while the sum is 40.

The square root of 28395139 is about 5328.7089430743. The cubic root of 28395139 is about 305.0806523250.

The spelling of 28395139 in words is "twenty-eight million, three hundred ninety-five thousand, one hundred thirty-nine".