27988474771 has 4 divisors (see below), whose sum is σ = 28105581600. Its totient is φ = 27871367944.

The previous prime is 27988474741. The next prime is 27988474793. The reversal of 27988474771 is 17747488972.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27988474771 - 2⁹ = 27988474259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27988474741) 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, 58553056 + ... + 58553533.

It is an arithmetic number, because the mean of its divisors is an integer number (7026395400).

Almost surely, 2^27988474771 is an apocalyptic number.

27988474771 is a deficient number, since it is larger than the sum of its proper divisors (117106829).

27988474771 is a wasteful number, since it uses less digits than its factorization.

27988474771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117106828.

The product of its digits is 44255232, while the sum is 64.

The spelling of 27988474771 in words is "twenty-seven billion, nine hundred eighty-eight million, four hundred seventy-four thousand, seven hundred seventy-one".