28567389 has 4 divisors (see below), whose sum is σ = 38089856. Its totient is φ = 19044924.

The previous prime is 28567381. The next prime is 28567391. The reversal of 28567389 is 98376582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28567389 - 2³ = 28567381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28567381) 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, 4761229 + ... + 4761234.

It is an arithmetic number, because the mean of its divisors is an integer number (9522464).

Almost surely, 2^28567389 is an apocalyptic number.

It is an amenable number.

28567389 is a deficient number, since it is larger than the sum of its proper divisors (9522467).

28567389 is an equidigital number, since it uses as much as digits as its factorization.

28567389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9522466.

The product of its digits is 725760, while the sum is 48.

The square root of 28567389 is about 5344.8469575845. The cubic root of 28567389 is about 305.6963004176.

The spelling of 28567389 in words is "twenty-eight million, five hundred sixty-seven thousand, three hundred eighty-nine".