28831015 has 4 divisors (see below), whose sum is σ = 34597224. Its totient is φ = 23064808.

The previous prime is 28831007. The next prime is 28831073. The reversal of 28831015 is 51013882.

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 28831015 - 2³ = 28831007 is a prime.

It is a Duffinian number.

It is a congruent 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, 2883097 + ... + 2883106.

It is an arithmetic number, because the mean of its divisors is an integer number (8649306).

Almost surely, 2^28831015 is an apocalyptic number.

28831015 is a deficient number, since it is larger than the sum of its proper divisors (5766209).

28831015 is an equidigital number, since it uses as much as digits as its factorization.

28831015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5766208.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 28831015 is about 5369.4520204580. The cubic root of 28831015 is about 306.6337662930.

Adding to 28831015 its reverse (51013882), we get a palindrome (79844897).

The spelling of 28831015 in words is "twenty-eight million, eight hundred thirty-one thousand, fifteen".