27806376138 has 8 divisors (see below), whose sum is σ = 55612752288. Its totient is φ = 9268792044.

The previous prime is 27806376137. The next prime is 27806376167. The reversal of 27806376138 is 83167360872.

It is a sphenic number, since it is the product of 3 distinct primes.

27806376138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (27806376131) 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 3 ways as a sum of consecutive naturals, for example, 2317198006 + ... + 2317198017.

It is an arithmetic number, because the mean of its divisors is an integer number (6951594036).

Almost surely, 2^27806376138 is an apocalyptic number.

27806376138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

27806376138 is a wasteful number, since it uses less digits than its factorization.

27806376138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4634396028.

The product of its (nonzero) digits is 2032128, while the sum is 51.

The spelling of 27806376138 in words is "twenty-seven billion, eight hundred six million, three hundred seventy-six thousand, one hundred thirty-eight".