27640391264 has 48 divisors (see below), whose sum is σ = 54768954240. Its totient is φ = 13730964480.

The previous prime is 27640391221. The next prime is 27640391269. The reversal of 27640391264 is 46219304672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27640391269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10186772 + ... + 10189484.

It is an arithmetic number, because the mean of its divisors is an integer number (1141019880).

Almost surely, 2^27640391264 is an apocalyptic number.

It is an amenable number.

27640391264 is a deficient number, since it is larger than the sum of its proper divisors (27128562976).

27640391264 is a wasteful number, since it uses less digits than its factorization.

27640391264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4663 (or 4655 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 44.

The spelling of 27640391264 in words is "twenty-seven billion, six hundred forty million, three hundred ninety-one thousand, two hundred sixty-four".