27728587655 has 16 divisors (see below), whose sum is σ = 34434694080. Its totient is φ = 21409855488.

The previous prime is 27728587589. The next prime is 27728587657. The reversal of 27728587655 is 55678582772.

It is a cyclic number.

It is not a de Polignac number, because 27728587655 - 2²⁰ = 27727539079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27728587657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364454 + ... + 433916.

It is an arithmetic number, because the mean of its divisors is an integer number (2152168380).

Almost surely, 2^27728587655 is an apocalyptic number.

27728587655 is a deficient number, since it is larger than the sum of its proper divisors (6706106425).

27728587655 is a wasteful number, since it uses less digits than its factorization.

27728587655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72250.

The product of its digits is 65856000, while the sum is 62.

The spelling of 27728587655 in words is "twenty-seven billion, seven hundred twenty-eight million, five hundred eighty-seven thousand, six hundred fifty-five".