28810540813 has 4 divisors (see below), whose sum is σ = 28955317600. Its totient is φ = 28665764028.

The previous prime is 28810540799. The next prime is 28810540861. The reversal of 28810540813 is 31804501882.

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 a de Polignac number, because none of the positive numbers 2^k-28810540813 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 (28810040813) 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, 72388095 + ... + 72388492.

It is an arithmetic number, because the mean of its divisors is an integer number (7238829400).

Almost surely, 2^28810540813 is an apocalyptic number.

It is an amenable number.

28810540813 is a deficient number, since it is larger than the sum of its proper divisors (144776787).

28810540813 is a wasteful number, since it uses less digits than its factorization.

28810540813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144776786.

The product of its (nonzero) digits is 61440, while the sum is 40.

The spelling of 28810540813 in words is "twenty-eight billion, eight hundred ten million, five hundred forty thousand, eight hundred thirteen".