28046813 has 4 divisors (see below), whose sum is σ = 28082208. Its totient is φ = 28011420.

The previous prime is 28046801. The next prime is 28046849. The reversal of 28046813 is 31864082.

28046813 is nontrivially palindromic in base 7.

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 a cyclic number.

It is not a de Polignac number, because 28046813 - 2⁶ = 28046749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28046813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28046873) 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, 16481 + ... + 18102.

It is an arithmetic number, because the mean of its divisors is an integer number (7020552).

Almost surely, 2^28046813 is an apocalyptic number.

It is an amenable number.

28046813 is a deficient number, since it is larger than the sum of its proper divisors (35395).

28046813 is an equidigital number, since it uses as much as digits as its factorization.

28046813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35394.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 28046813 is about 5295.9241875238. The cubic root of 28046813 is about 303.8280313449.

The spelling of 28046813 in words is "twenty-eight million, forty-six thousand, eight hundred thirteen".