28344913 has 4 divisors (see below), whose sum is σ = 28409920. Its totient is φ = 28279908.

The previous prime is 28344907. The next prime is 28344917. The reversal of 28344913 is 31944382.

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 a cyclic number.

It is not a de Polignac number, because 28344913 - 2⁹ = 28344401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28344917) 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, 31845 + ... + 32722.

It is an arithmetic number, because the mean of its divisors is an integer number (7102480).

Almost surely, 2^28344913 is an apocalyptic number.

It is an amenable number.

28344913 is a deficient number, since it is larger than the sum of its proper divisors (65007).

28344913 is an equidigital number, since it uses as much as digits as its factorization.

28344913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65006.

The product of its digits is 20736, while the sum is 34.

The square root of 28344913 is about 5323.9940833927. The cubic root of 28344913 is about 304.9006681818.

The spelling of 28344913 in words is "twenty-eight million, three hundred forty-four thousand, nine hundred thirteen".