28680015 has 32 divisors (see below), whose sum is σ = 56480256. Its totient is φ = 12101760.

The previous prime is 28680007. The next prime is 28680017. The reversal of 28680015 is 51008682.

It is not a de Polignac number, because 28680015 - 2³ = 28680007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28680017) 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 31 ways as a sum of consecutive naturals, for example, 9141 + ... + 11870.

It is an arithmetic number, because the mean of its divisors is an integer number (1765008).

Almost surely, 2^28680015 is an apocalyptic number.

28680015 is a deficient number, since it is larger than the sum of its proper divisors (27800241).

28680015 is a wasteful number, since it uses less digits than its factorization.

28680015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21039.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 28680015 is about 5355.3725360613. The cubic root of 28680015 is about 306.0975061986.

Adding to 28680015 its reverse (51008682), we get a palindrome (79688697).

The spelling of 28680015 in words is "twenty-eight million, six hundred eighty thousand, fifteen".