27667971 has 24 divisors (see below), whose sum is σ = 43215120. Its totient is φ = 16998336.

The previous prime is 27667957. The next prime is 27667973. The reversal of 27667971 is 17976672.

It is not a de Polignac number, because 27667971 - 2²¹ = 25570819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27667973) 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 23 ways as a sum of consecutive naturals, for example, 4141 + ... + 8513.

It is an arithmetic number, because the mean of its divisors is an integer number (1800630).

Almost surely, 2^27667971 is an apocalyptic number.

27667971 is a deficient number, since it is larger than the sum of its proper divisors (15547149).

27667971 is a wasteful number, since it uses less digits than its factorization.

27667971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4435 (or 4432 counting only the distinct ones).

The product of its digits is 222264, while the sum is 45.

The square root of 27667971 is about 5260.0352660415. The cubic root of 27667971 is about 302.4538408270.

The spelling of 27667971 in words is "twenty-seven million, six hundred sixty-seven thousand, nine hundred seventy-one".