28344551 has 4 divisors (see below), whose sum is σ = 28767672. Its totient is φ = 27921432.

The previous prime is 28344521. The next prime is 28344587. The reversal of 28344551 is 15544382.

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-28344551 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 (28344521) 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, 211460 + ... + 211593.

It is an arithmetic number, because the mean of its divisors is an integer number (7191918).

Almost surely, 2^28344551 is an apocalyptic number.

28344551 is a deficient number, since it is larger than the sum of its proper divisors (423121).

28344551 is an equidigital number, since it uses as much as digits as its factorization.

28344551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423120.

The product of its digits is 19200, while the sum is 32.

The square root of 28344551 is about 5323.9600862516. The cubic root of 28344551 is about 304.8993701887.

The spelling of 28344551 in words is "twenty-eight million, three hundred forty-four thousand, five hundred fifty-one".