28344307 has 4 divisors (see below), whose sum is σ = 28360800. Its totient is φ = 28327816.

The previous prime is 28344293. The next prime is 28344313. The reversal of 28344307 is 70344382.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28344307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28344317) 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, 5323 + ... + 9220.

It is an arithmetic number, because the mean of its divisors is an integer number (7090200).

Almost surely, 2^28344307 is an apocalyptic number.

28344307 is a deficient number, since it is larger than the sum of its proper divisors (16493).

28344307 is a wasteful number, since it uses less digits than its factorization.

28344307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16492.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 28344307 is about 5323.9371709290. The cubic root of 28344307 is about 304.8984952920.

Adding to 28344307 its reverse (70344382), we get a palindrome (98688689).

The spelling of 28344307 in words is "twenty-eight million, three hundred forty-four thousand, three hundred seven".