28343381813 has 4 divisors (see below), whose sum is σ = 28361993568. Its totient is φ = 28324770060.

The previous prime is 28343381791. The next prime is 28343381849. The reversal of 28343381813 is 31818334382.

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 28343381813 - 2¹⁰ = 28343380789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28343383813) 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, 9303593 + ... + 9306638.

It is an arithmetic number, because the mean of its divisors is an integer number (7090498392).

Almost surely, 2^28343381813 is an apocalyptic number.

It is an amenable number.

28343381813 is a deficient number, since it is larger than the sum of its proper divisors (18611755).

28343381813 is a wasteful number, since it uses less digits than its factorization.

28343381813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18611754.

The product of its digits is 331776, while the sum is 44.

The spelling of 28343381813 in words is "twenty-eight billion, three hundred forty-three million, three hundred eighty-one thousand, eight hundred thirteen".