28364813 has 8 divisors (see below), whose sum is σ = 29462400. Its totient is φ = 27275248.

The previous prime is 28364797. The next prime is 28364839. The reversal of 28364813 is 31846382.

It is a happy number.

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 28364813 - 2⁴ = 28364797 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 (28364873) 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, 5768 + ... + 9486.

It is an arithmetic number, because the mean of its divisors is an integer number (3682800).

Almost surely, 2^28364813 is an apocalyptic number.

It is an amenable number.

28364813 is a deficient number, since it is larger than the sum of its proper divisors (1097587).

28364813 is a wasteful number, since it uses less digits than its factorization.

28364813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011.

The product of its digits is 27648, while the sum is 35.

The square root of 28364813 is about 5325.8626531295. The cubic root of 28364813 is about 304.9720049554.

The spelling of 28364813 in words is "twenty-eight million, three hundred sixty-four thousand, eight hundred thirteen".