27728745156 has 72 divisors (see below), whose sum is σ = 81300914240. Its totient is φ = 7804247616.

The previous prime is 27728745097. The next prime is 27728745193. The reversal of 27728745156 is 65154782772.

27728745156 is a `hidden beast` number, since 277 + 287 + 45 + 1 + 56 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 804271 + ... + 838038.

Almost surely, 2^27728745156 is an apocalyptic number.

It is an amenable number.

27728745156 is an abundant number, since it is smaller than the sum of its proper divisors (53572169084).

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

27728745156 is a wasteful number, since it uses less digits than its factorization.

27728745156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642393 (or 1642388 counting only the distinct ones).

The product of its digits is 6585600, while the sum is 54.

The spelling of 27728745156 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred forty-five thousand, one hundred fifty-six".