27438955686 has 16 divisors (see below), whose sum is σ = 60975457200. Its totient is φ = 9146318544.

The previous prime is 27438955673. The next prime is 27438955699. The reversal of 27438955686 is 68655983472.

It is a happy number.

27438955686 is a `hidden beast` number, since 2 + 74 + 3 + 8 + 9 + 556 + 8 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (27438955673) and next prime (27438955699).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254064351 + ... + 254064458.

It is an arithmetic number, because the mean of its divisors is an integer number (3810966075).

Almost surely, 2^27438955686 is an apocalyptic number.

27438955686 is an abundant number, since it is smaller than the sum of its proper divisors (33536501514).

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

27438955686 is a wasteful number, since it uses less digits than its factorization.

27438955686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508128820 (or 508128814 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 63.

The spelling of 27438955686 in words is "twenty-seven billion, four hundred thirty-eight million, nine hundred fifty-five thousand, six hundred eighty-six".