28844013 has 16 divisors (see below), whose sum is σ = 42932736. Its totient is φ = 17073840.

The previous prime is 28843993. The next prime is 28844021. The reversal of 28844013 is 31044882.

It is not a de Polignac number, because 28844013 - 2⁶ = 28843949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28844083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8745 + ... + 11582.

It is an arithmetic number, because the mean of its divisors is an integer number (2683296).

Almost surely, 2^28844013 is an apocalyptic number.

It is an amenable number.

28844013 is a deficient number, since it is larger than the sum of its proper divisors (14088723).

28844013 is a wasteful number, since it uses less digits than its factorization.

28844013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20384.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 28844013 is about 5370.6622496672. The cubic root of 28844013 is about 306.6798396725.

Adding to 28844013 its reverse (31044882), we get a palindrome (59888895).

The spelling of 28844013 in words is "twenty-eight million, eight hundred forty-four thousand, thirteen".