28159206913 has 4 divisors (see below), whose sum is σ = 28167047748. Its totient is φ = 28151366080.

The previous prime is 28159206893. The next prime is 28159206917. The reversal of 28159206913 is 31960295182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31960295182 = 2 ⋅15980147591.

It can be written as a sum of positive squares in 2 ways, for example, as 15131952144 + 13027254769 = 123012^2 + 114137^2 .

It is a cyclic number.

It is not a de Polignac number, because 28159206913 - 2¹³ = 28159198721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28159206917) 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, 3915028 + ... + 3922213.

It is an arithmetic number, because the mean of its divisors is an integer number (7041761937).

Almost surely, 2^28159206913 is an apocalyptic number.

It is an amenable number.

28159206913 is a deficient number, since it is larger than the sum of its proper divisors (7840835).

28159206913 is an equidigital number, since it uses as much as digits as its factorization.

28159206913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7840834.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 28159206913 in words is "twenty-eight billion, one hundred fifty-nine million, two hundred six thousand, nine hundred thirteen".