28344247 has 4 divisors (see below), whose sum is σ = 28354896. Its totient is φ = 28333600.

The previous prime is 28344227. The next prime is 28344259. The reversal of 28344247 is 74244382.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28344247 - 2¹⁹ = 27819959 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 (28344227) 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, 2622 + ... + 7972.

It is an arithmetic number, because the mean of its divisors is an integer number (7088724).

Almost surely, 2^28344247 is an apocalyptic number.

28344247 is a deficient number, since it is larger than the sum of its proper divisors (10649).

28344247 is an equidigital number, since it uses as much as digits as its factorization.

28344247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10648.

The product of its digits is 43008, while the sum is 34.

The square root of 28344247 is about 5323.9315359986. The cubic root of 28344247 is about 304.8982801527.

The spelling of 28344247 in words is "twenty-eight million, three hundred forty-four thousand, two hundred forty-seven".