28338213 has 4 divisors (see below), whose sum is σ = 37784288. Its totient is φ = 18892140.

The previous prime is 28338187. The next prime is 28338229. The reversal of 28338213 is 31283382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28338213 - 2⁸ = 28337957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28338283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4723033 + ... + 4723038.

It is an arithmetic number, because the mean of its divisors is an integer number (9446072).

Almost surely, 2^28338213 is an apocalyptic number.

It is an amenable number.

28338213 is a deficient number, since it is larger than the sum of its proper divisors (9446075).

28338213 is an equidigital number, since it uses as much as digits as its factorization.

28338213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9446074.

The product of its digits is 6912, while the sum is 30.

The square root of 28338213 is about 5323.3648193600. The cubic root of 28338213 is about 304.8766427602.

The spelling of 28338213 in words is "twenty-eight million, three hundred thirty-eight thousand, two hundred thirteen".