28736815 has 16 divisors (see below), whose sum is σ = 35282016. Its totient is φ = 22464000.

The previous prime is 28736801. The next prime is 28736833. The reversal of 28736815 is 51863782.

It is a de Polignac number, because none of the positive numbers 2^k-28736815 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 47515 + ... + 48115.

It is an arithmetic number, because the mean of its divisors is an integer number (2205126).

Almost surely, 2^28736815 is an apocalyptic number.

28736815 is a deficient number, since it is larger than the sum of its proper divisors (6545201).

28736815 is a wasteful number, since it uses less digits than its factorization.

28736815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810.

The product of its digits is 80640, while the sum is 40.

The square root of 28736815 is about 5360.6729987941. The cubic root of 28736815 is about 306.2994455774.

The spelling of 28736815 in words is "twenty-eight million, seven hundred thirty-six thousand, eight hundred fifteen".