28368815 has 16 divisors (see below), whose sum is σ = 35445600. Its totient is φ = 21770112.

The previous prime is 28368811. The next prime is 28368817. The reversal of 28368815 is 51886382.

It is a cyclic number.

It is not a de Polignac number, because 28368815 - 2² = 28368811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28368811) 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 15 ways as a sum of consecutive naturals, for example, 25409 + ... + 26501.

It is an arithmetic number, because the mean of its divisors is an integer number (2215350).

Almost surely, 2^28368815 is an apocalyptic number.

28368815 is a deficient number, since it is larger than the sum of its proper divisors (7076785).

28368815 is a wasteful number, since it uses less digits than its factorization.

28368815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306.

The product of its digits is 92160, while the sum is 41.

The square root of 28368815 is about 5326.2383536601. The cubic root of 28368815 is about 304.9863471448.

The spelling of 28368815 in words is "twenty-eight million, three hundred sixty-eight thousand, eight hundred fifteen".