28796905009 has 4 divisors (see below), whose sum is σ = 28899385380. Its totient is φ = 28694424640.

The previous prime is 28796904953. The next prime is 28796905021. The reversal of 28796905009 is 90050969782.

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 13636400625 + 15160504384 = 116775^2 + 123128^2 .

It is a cyclic number.

It is not a de Polignac number, because 28796905009 - 2⁹ = 28796904497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28796905069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51239764 + ... + 51240325.

It is an arithmetic number, because the mean of its divisors is an integer number (7224846345).

Almost surely, 2^28796905009 is an apocalyptic number.

It is an amenable number.

28796905009 is a deficient number, since it is larger than the sum of its proper divisors (102480371).

28796905009 is a wasteful number, since it uses less digits than its factorization.

28796905009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102480370.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 28796905009 in words is "twenty-eight billion, seven hundred ninety-six million, nine hundred five thousand, nine".