28223013 has 32 divisors (see below), whose sum is σ = 47036416. Its totient is φ = 14655168.

The previous prime is 28223011. The next prime is 28223017. The reversal of 28223013 is 31032282.

It is not a de Polignac number, because 28223013 - 2¹ = 28223011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28223011) 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 31 ways as a sum of consecutive naturals, for example, 17520 + ... + 19062.

It is an arithmetic number, because the mean of its divisors is an integer number (1469888).

Almost surely, 2^28223013 is an apocalyptic number.

It is an amenable number.

28223013 is a deficient number, since it is larger than the sum of its proper divisors (18813403).

28223013 is a wasteful number, since it uses less digits than its factorization.

28223013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 28223013 is about 5312.5335763645. The cubic root of 28223013 is about 304.4629553107.

Adding to 28223013 its reverse (31032282), we get a palindrome (59255295).

The spelling of 28223013 in words is "twenty-eight million, two hundred twenty-three thousand, thirteen".