27773978964 has 12 divisors (see below), whose sum is σ = 64805950944. Its totient is φ = 9257992984.

The previous prime is 27773978959. The next prime is 27773978971. The reversal of 27773978964 is 46987937772.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1157249112 + ... + 1157249135.

It is an arithmetic number, because the mean of its divisors is an integer number (5400495912).

Almost surely, 2^27773978964 is an apocalyptic number.

It is an amenable number.

27773978964 is an abundant number, since it is smaller than the sum of its proper divisors (37031971980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27773978964 is a wasteful number, since it uses less digits than its factorization.

27773978964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2314498254 (or 2314498252 counting only the distinct ones).

The product of its digits is 224042112, while the sum is 69.

The spelling of 27773978964 in words is "twenty-seven billion, seven hundred seventy-three million, nine hundred seventy-eight thousand, nine hundred sixty-four".