28268815 has 4 divisors (see below), whose sum is σ = 33922584. Its totient is φ = 22615048.

The previous prime is 28268813. The next prime is 28268819. The reversal of 28268815 is 51886282.

It is a happy number.

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 28268815 - 2¹ = 28268813 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28268813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2826877 + ... + 2826886.

It is an arithmetic number, because the mean of its divisors is an integer number (8480646).

Almost surely, 2^28268815 is an apocalyptic number.

28268815 is a deficient number, since it is larger than the sum of its proper divisors (5653769).

28268815 is an equidigital number, since it uses as much as digits as its factorization.

28268815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5653768.

The product of its digits is 61440, while the sum is 40.

The square root of 28268815 is about 5316.8425780721. The cubic root of 28268815 is about 304.6275665504.

The spelling of 28268815 in words is "twenty-eight million, two hundred sixty-eight thousand, eight hundred fifteen".