27729271007881 has 3 divisors (see below), whose sum is σ = 27729276273741. Its totient is φ = 27729265742022.

The previous prime is 27729271007873. The next prime is 27729271007887. The reversal of 27729271007881 is 18870017292772.

The square root of 27729271007881 is 5265859.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 27729271007881 - 2³ = 27729271007873 is a prime.

It is a super-2 number, since 2×27729271007881² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27729271007887) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2632930 + ... + 7898788.

It is an arithmetic number, because the mean of its divisors is an integer number (9243092091247).

Almost surely, 2^{27729271007881} is an apocalyptic number.

27729271007881 is the 5265859-th square number.

27729271007881 is the 2632930-th centered octagonal number.

It is an amenable number.

27729271007881 is a deficient number, since it is larger than the sum of its proper divisors (5265860).

27729271007881 is an frugal number, since it uses more digits than its factorization.

27729271007881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10531718 (or 5265859 counting only the distinct ones).

The product of its (nonzero) digits is 11063808, while the sum is 61.

The spelling of 27729271007881 in words is "twenty-seven trillion, seven hundred twenty-nine billion, two hundred seventy-one million, seven thousand, eight hundred eighty-one".