27806564838 has 16 divisors (see below), whose sum is σ = 59891062896. Its totient is φ = 8555866080.

The previous prime is 27806564707. The next prime is 27806564839. The reversal of 27806564838 is 83846560872.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27806564839) 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, 178247133 + ... + 178247288.

It is an arithmetic number, because the mean of its divisors is an integer number (3743191431).

Almost surely, 2^27806564838 is an apocalyptic number.

27806564838 is an abundant number, since it is smaller than the sum of its proper divisors (32084498058).

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

27806564838 is a wasteful number, since it uses less digits than its factorization.

27806564838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356494439.

The product of its (nonzero) digits is 15482880, while the sum is 57.

The spelling of 27806564838 in words is "twenty-seven billion, eight hundred six million, five hundred sixty-four thousand, eight hundred thirty-eight".