28057497777913 has 4 divisors (see below), whose sum is σ = 28060951866768. Its totient is φ = 28054043689060.

The previous prime is 28057497777899. The next prime is 28057497777943. The reversal of 28057497777913 is 31977779475082.

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-28057497777913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28057497777913.

It is not an unprimeable number, because it can be changed into a prime (28057497777943) 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, 1727032243 + ... + 1727048488.

It is an arithmetic number, because the mean of its divisors is an integer number (7015237966692).

Almost surely, 2^{28057497777913} is an apocalyptic number.

It is an amenable number.

28057497777913 is a deficient number, since it is larger than the sum of its proper divisors (3454088855).

28057497777913 is an equidigital number, since it uses as much as digits as its factorization.

28057497777913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3454088854.

The product of its (nonzero) digits is 1306912320, while the sum is 76.

The spelling of 28057497777913 in words is "twenty-eight trillion, fifty-seven billion, four hundred ninety-seven million, seven hundred seventy-seven thousand, nine hundred thirteen".