28396815 has 16 divisors (see below), whose sum is σ = 45557856. Its totient is φ = 15104000.

The previous prime is 28396807. The next prime is 28396831. The reversal of 28396815 is 51869382.

It is not a de Polignac number, because 28396815 - 2³ = 28396807 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3655 + ... + 8375.

It is an arithmetic number, because the mean of its divisors is an integer number (2847366).

Almost surely, 2^28396815 is an apocalyptic number.

28396815 is a deficient number, since it is larger than the sum of its proper divisors (17161041).

28396815 is a wasteful number, since it uses less digits than its factorization.

28396815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5130.

The product of its digits is 103680, while the sum is 42.

The square root of 28396815 is about 5328.8662021109. The cubic root of 28396815 is about 305.0866545860.

The spelling of 28396815 in words is "twenty-eight million, three hundred ninety-six thousand, eight hundred fifteen".