28270839 has 4 divisors (see below), whose sum is σ = 37694456. Its totient is φ = 18847224.

The previous prime is 28270831. The next prime is 28270859. The reversal of 28270839 is 93807282.

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

It is not a de Polignac number, because 28270839 - 2³ = 28270831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28270797 and 28270806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28270831) 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, 4711804 + ... + 4711809.

It is an arithmetic number, because the mean of its divisors is an integer number (9423614).

Almost surely, 2^28270839 is an apocalyptic number.

28270839 is a deficient number, since it is larger than the sum of its proper divisors (9423617).

28270839 is an equidigital number, since it uses as much as digits as its factorization.

28270839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9423616.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 28270839 is about 5317.0329131951. The cubic root of 28270839 is about 304.6348366521.

The spelling of 28270839 in words is "twenty-eight million, two hundred seventy thousand, eight hundred thirty-nine".