28500115 has 24 divisors (see below), whose sum is σ = 40457232. Its totient is φ = 19212480.

The previous prime is 28500113. The next prime is 28500137. The reversal of 28500115 is 51100582.

It is not a de Polignac number, because 28500115 - 2¹ = 28500113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28500113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13992 + ... + 15898.

It is an arithmetic number, because the mean of its divisors is an integer number (1685718).

Almost surely, 2^28500115 is an apocalyptic number.

28500115 is a deficient number, since it is larger than the sum of its proper divisors (11957117).

28500115 is a wasteful number, since it uses less digits than its factorization.

28500115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987 (or 1980 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 28500115 is about 5338.5498967416. The cubic root of 28500115 is about 305.4561480608.

Adding to 28500115 its reverse (51100582), we get a palindrome (79600697).

The spelling of 28500115 in words is "twenty-eight million, five hundred thousand, one hundred fifteen".