28449287 has 4 divisors (see below), whose sum is σ = 28986120. Its totient is φ = 27912456.

The previous prime is 28449277. The next prime is 28449293. The reversal of 28449287 is 78294482.

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 28449287 - 2¹² = 28445191 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 (28449217) 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, 268337 + ... + 268442.

It is an arithmetic number, because the mean of its divisors is an integer number (7246530).

Almost surely, 2^28449287 is an apocalyptic number.

28449287 is a deficient number, since it is larger than the sum of its proper divisors (536833).

28449287 is an equidigital number, since it uses as much as digits as its factorization.

28449287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536832.

The product of its digits is 258048, while the sum is 44.

The square root of 28449287 is about 5333.7873035958. The cubic root of 28449287 is about 305.2744533093.

The spelling of 28449287 in words is "twenty-eight million, four hundred forty-nine thousand, two hundred eighty-seven".