27628978177 has 4 divisors (see below), whose sum is σ = 27630623920. Its totient is φ = 27627332436.

The previous prime is 27628978171. The next prime is 27628978189. The reversal of 27628978177 is 77187982672.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27628978177 - 2²³ = 27620589569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27628978171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 797427 + ... + 831352.

It is an arithmetic number, because the mean of its divisors is an integer number (6907655980).

Almost surely, 2^27628978177 is an apocalyptic number.

It is an amenable number.

27628978177 is a deficient number, since it is larger than the sum of its proper divisors (1645743).

27628978177 is a wasteful number, since it uses less digits than its factorization.

27628978177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645742.

The product of its digits is 33191424, while the sum is 64.

The spelling of 27628978177 in words is "twenty-seven billion, six hundred twenty-eight million, nine hundred seventy-eight thousand, one hundred seventy-seven".