28340213 has 8 divisors (see below), whose sum is σ = 31500576. Its totient is φ = 25277200.

The previous prime is 28340203. The next prime is 28340219. The reversal of 28340213 is 31204382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28340213 - 2⁴ = 28340197 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 (28340219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23723 + ... + 24888.

It is an arithmetic number, because the mean of its divisors is an integer number (3937572).

Almost surely, 2^28340213 is an apocalyptic number.

It is an amenable number.

28340213 is a deficient number, since it is larger than the sum of its proper divisors (3160363).

28340213 is a wasteful number, since it uses less digits than its factorization.

28340213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48675.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 28340213 is about 5323.5526671575. The cubic root of 28340213 is about 304.8838149243.

Adding to 28340213 its reverse (31204382), we get a palindrome (59544595).

The spelling of 28340213 in words is "twenty-eight million, three hundred forty thousand, two hundred thirteen".