28296815 has 4 divisors (see below), whose sum is σ = 33956184. Its totient is φ = 22637448.

The previous prime is 28296803. The next prime is 28296817. The reversal of 28296815 is 51869282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28296815 - 2⁴ = 28296799 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 (28296817) 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 3 ways as a sum of consecutive naturals, for example, 2829677 + ... + 2829686.

It is an arithmetic number, because the mean of its divisors is an integer number (8489046).

Almost surely, 2^28296815 is an apocalyptic number.

28296815 is a deficient number, since it is larger than the sum of its proper divisors (5659369).

28296815 is an equidigital number, since it uses as much as digits as its factorization.

28296815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5659368.

The product of its digits is 69120, while the sum is 41.

The square root of 28296815 is about 5319.4750680871. The cubic root of 28296815 is about 304.7281102916.

The spelling of 28296815 in words is "twenty-eight million, two hundred ninety-six thousand, eight hundred fifteen".