28081657113 has 4 divisors (see below), whose sum is σ = 37442209488. Its totient is φ = 18721104740.

The previous prime is 28081657081. The next prime is 28081657133. The reversal of 28081657113 is 31175618082.

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 28081657113 - 2⁵ = 28081657081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28081657133) 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, 4680276183 + ... + 4680276188.

It is an arithmetic number, because the mean of its divisors is an integer number (9360552372).

Almost surely, 2^28081657113 is an apocalyptic number.

It is an amenable number.

28081657113 is a deficient number, since it is larger than the sum of its proper divisors (9360552375).

28081657113 is an equidigital number, since it uses as much as digits as its factorization.

28081657113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9360552374.

The product of its (nonzero) digits is 80640, while the sum is 42.

The spelling of 28081657113 in words is "twenty-eight billion, eighty-one million, six hundred fifty-seven thousand, one hundred thirteen".