27964479971 has 4 divisors (see below), whose sum is σ = 27977868600. Its totient is φ = 27951091344.

The previous prime is 27964479947. The next prime is 27964479979. The reversal of 27964479971 is 17997446972.

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 27964479971 - 2³⁴ = 10784610787 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27964479898 and 27964479907.

It is not an unprimeable number, because it can be changed into a prime (27964479979) 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, 6691181 + ... + 6695358.

It is an arithmetic number, because the mean of its divisors is an integer number (6994467150).

Almost surely, 2^27964479971 is an apocalyptic number.

27964479971 is a deficient number, since it is larger than the sum of its proper divisors (13388629).

27964479971 is a wasteful number, since it uses less digits than its factorization.

27964479971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13388628.

The product of its digits is 48009024, while the sum is 65.

The spelling of 27964479971 in words is "twenty-seven billion, nine hundred sixty-four million, four hundred seventy-nine thousand, nine hundred seventy-one".