27979549947 has 24 divisors (see below), whose sum is σ = 41196645360. Its totient is φ = 18295684800.

The previous prime is 27979549921. The next prime is 27979549957. The reversal of 27979549947 is 74994597972.

27979549947 is a `hidden beast` number, since 2 + 7 + 9 + 7 + 95 + 499 + 47 = 666.

It is not a de Polignac number, because 27979549947 - 2⁸ = 27979549691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27979549907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46572 + ... + 241097.

It is an arithmetic number, because the mean of its divisors is an integer number (1716526890).

Almost surely, 2^27979549947 is an apocalyptic number.

27979549947 is a deficient number, since it is larger than the sum of its proper divisors (13217095413).

27979549947 is a wasteful number, since it uses less digits than its factorization.

27979549947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287883 (or 287880 counting only the distinct ones).

The product of its digits is 360067680, while the sum is 72.

The spelling of 27979549947 in words is "twenty-seven billion, nine hundred seventy-nine million, five hundred forty-nine thousand, nine hundred forty-seven".