27400685 has 32 divisors (see below), whose sum is σ = 37975392. Its totient is φ = 18800640.

The previous prime is 27400663. The next prime is 27400687. The reversal of 27400685 is 58600472.

It can be written as a sum of positive squares in 16 ways, for example, as 14303524 + 13097161 = 3782^2 + 3619^2 .

It is a de Polignac number, because none of the positive numbers 2^k-27400685 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27400687) 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 31 ways as a sum of consecutive naturals, for example, 151295 + ... + 151475.

It is an arithmetic number, because the mean of its divisors is an integer number (1186731).

Almost surely, 2^27400685 is an apocalyptic number.

It is an amenable number.

27400685 is a deficient number, since it is larger than the sum of its proper divisors (10574707).

27400685 is a wasteful number, since it uses less digits than its factorization.

27400685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 27400685 is about 5234.5663621737. The cubic root of 27400685 is about 301.4767374132.

The spelling of 27400685 in words is "twenty-seven million, four hundred thousand, six hundred eighty-five".