28807115 has 4 divisors (see below), whose sum is σ = 34568544. Its totient is φ = 23045688.

The previous prime is 28807081. The next prime is 28807139. The reversal of 28807115 is 51170882.

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 28807115 - 2¹⁴ = 28790731 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 2880707 + ... + 2880716.

It is an arithmetic number, because the mean of its divisors is an integer number (8642136).

Almost surely, 2^28807115 is an apocalyptic number.

28807115 is a deficient number, since it is larger than the sum of its proper divisors (5761429).

28807115 is an equidigital number, since it uses as much as digits as its factorization.

28807115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5761428.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 28807115 is about 5367.2260060482. The cubic root of 28807115 is about 306.5490129698.

Adding to 28807115 its reverse (51170882), we get a palindrome (79977997).

The spelling of 28807115 in words is "twenty-eight million, eight hundred seven thousand, one hundred fifteen".