27681738 has 32 divisors (see below), whose sum is σ = 64350720. Its totient is φ = 7774320.

The previous prime is 27681737. The next prime is 27681743. The reversal of 27681738 is 83718672.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 27681738.

It is not an unprimeable number, because it can be changed into a prime (27681733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3108 + ... + 8063.

It is an arithmetic number, because the mean of its divisors is an integer number (2010960).

Almost surely, 2^27681738 is an apocalyptic number.

27681738 is an abundant number, since it is smaller than the sum of its proper divisors (36668982).

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

27681738 is a wasteful number, since it uses less digits than its factorization.

27681738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11242.

The product of its digits is 112896, while the sum is 42.

The square root of 27681738 is about 5261.3437447101. The cubic root of 27681738 is about 302.5039973973.

The spelling of 27681738 in words is "twenty-seven million, six hundred eighty-one thousand, seven hundred thirty-eight".