28712013 has 16 divisors (see below), whose sum is σ = 42783552. Its totient is φ = 16976000.

The previous prime is 28712011. The next prime is 28712041. The reversal of 28712013 is 31021782.

It is a cyclic number.

It is not a de Polignac number, because 28712013 - 2¹ = 28712011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28712011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9258 + ... + 11963.

It is an arithmetic number, because the mean of its divisors is an integer number (2673972).

Almost surely, 2^28712013 is an apocalyptic number.

It is an amenable number.

28712013 is a deficient number, since it is larger than the sum of its proper divisors (14071539).

28712013 is a wasteful number, since it uses less digits than its factorization.

28712013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21276.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 28712013 is about 5358.3591704924. The cubic root of 28712013 is about 306.2113005104.

Adding to 28712013 its reverse (31021782), we get a palindrome (59733795).

It can be divided in two parts, 2871 and 2013, that added together give a palindrome (4884).

The spelling of 28712013 in words is "twenty-eight million, seven hundred twelve thousand, thirteen".