28823013 has 32 divisors (see below), whose sum is σ = 44668800. Its totient is φ = 18345600.

The previous prime is 28823009. The next prime is 28823021. The reversal of 28823013 is 31032882.

It is not a de Polignac number, because 28823013 - 2² = 28823009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28823063) 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, 102433 + ... + 102713.

It is an arithmetic number, because the mean of its divisors is an integer number (1395900).

Almost surely, 2^28823013 is an apocalyptic number.

It is an amenable number.

28823013 is a deficient number, since it is larger than the sum of its proper divisors (15845787).

28823013 is a wasteful number, since it uses less digits than its factorization.

28823013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28823013 is about 5368.7068275331. The cubic root of 28823013 is about 306.6053951050.

Adding to 28823013 its reverse (31032882), we get a palindrome (59855895).

The spelling of 28823013 in words is "twenty-eight million, eight hundred twenty-three thousand, thirteen".