27687121 has 16 divisors (see below), whose sum is σ = 34864128. Its totient is φ = 21358800.

The previous prime is 27687119. The next prime is 27687131. The reversal of 27687121 is 12178672.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 27687121 - 2¹ = 27687119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27687131) 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, 6186 + ... + 9676.

It is an arithmetic number, because the mean of its divisors is an integer number (2179008).

Almost surely, 2^27687121 is an apocalyptic number.

It is an amenable number.

27687121 is a deficient number, since it is larger than the sum of its proper divisors (7177007).

27687121 is a wasteful number, since it uses less digits than its factorization.

27687121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3612.

The product of its digits is 9408, while the sum is 34.

The square root of 27687121 is about 5261.8552811722. The cubic root of 27687121 is about 302.5236044691.

It can be divided in two parts, 2768 and 7121, that added together give a palindrome (9889).

The spelling of 27687121 in words is "twenty-seven million, six hundred eighty-seven thousand, one hundred twenty-one".