27690138 has 24 divisors (see below), whose sum is σ = 68566368. Its totient is φ = 7911432.

The previous prime is 27690107. The next prime is 27690139. The reversal of 27690138 is 83109672.

It is not an unprimeable number, because it can be changed into a prime (27690139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109756 + ... + 110007.

It is an arithmetic number, because the mean of its divisors is an integer number (2856932).

Almost surely, 2^27690138 is an apocalyptic number.

27690138 is an abundant number, since it is smaller than the sum of its proper divisors (40876230).

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

27690138 is a wasteful number, since it uses less digits than its factorization.

27690138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219778 (or 219775 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 27690138 is about 5262.1419593166. The cubic root of 27690138 is about 302.5345924969.

The spelling of 27690138 in words is "twenty-seven million, six hundred ninety thousand, one hundred thirty-eight".