28475239 has 4 divisors (see below), whose sum is σ = 30665656. Its totient is φ = 26284824.

The previous prime is 28475203. The next prime is 28475261. The reversal of 28475239 is 93257482.

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 28475239 - 2²³ = 20086631 is a prime.

It is a super-2 number, since 2×28475239² = 1621678472214242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28479239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1095189 + ... + 1095214.

It is an arithmetic number, because the mean of its divisors is an integer number (7666414).

Almost surely, 2^28475239 is an apocalyptic number.

28475239 is a deficient number, since it is larger than the sum of its proper divisors (2190417).

28475239 is a wasteful number, since it uses less digits than its factorization.

28475239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190416.

The product of its digits is 120960, while the sum is 40.

The square root of 28475239 is about 5336.2195419604. The cubic root of 28475239 is about 305.3672508877.

The spelling of 28475239 in words is "twenty-eight million, four hundred seventy-five thousand, two hundred thirty-nine".