28530841813 has 4 divisors (see below), whose sum is σ = 28580984460. Its totient is φ = 28480699168.

The previous prime is 28530841793. The next prime is 28530841817. The reversal of 28530841813 is 31814803582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17697779089 + 10833062724 = 133033^2 + 104082^2 .

It is a cyclic number.

It is not a de Polignac number, because 28530841813 - 2⁹ = 28530841301 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 28530841813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28530841817) 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, 25070470 + ... + 25071607.

It is an arithmetic number, because the mean of its divisors is an integer number (7145246115).

Almost surely, 2^28530841813 is an apocalyptic number.

It is an amenable number.

28530841813 is a deficient number, since it is larger than the sum of its proper divisors (50142647).

28530841813 is an equidigital number, since it uses as much as digits as its factorization.

28530841813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50142646.

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 28530841813 in words is "twenty-eight billion, five hundred thirty million, eight hundred forty-one thousand, eight hundred thirteen".