27427755405 has 16 divisors (see below), whose sum is σ = 44336827584. Its totient is φ = 14477329920.

The previous prime is 27427755391. The next prime is 27427755431. The reversal of 27427755405 is 50455772472.

It is a happy number.

It is not a de Polignac number, because 27427755405 - 2⁴ = 27427755389 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 9423891 + ... + 9426800.

It is an arithmetic number, because the mean of its divisors is an integer number (2771051724).

Almost surely, 2^27427755405 is an apocalyptic number.

It is an amenable number.

27427755405 is a deficient number, since it is larger than the sum of its proper divisors (16909072179).

27427755405 is a wasteful number, since it uses less digits than its factorization.

27427755405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18850796.

The product of its (nonzero) digits is 2744000, while the sum is 48.

The spelling of 27427755405 in words is "twenty-seven billion, four hundred twenty-seven million, seven hundred fifty-five thousand, four hundred five".