27966971 has 4 divisors (see below), whose sum is σ = 28360944. Its totient is φ = 27573000.

The previous prime is 27966947. The next prime is 27966973. The reversal of 27966971 is 17966972.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27966971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27966973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196880 + ... + 197021.

It is an arithmetic number, because the mean of its divisors is an integer number (7090236).

Almost surely, 2^27966971 is an apocalyptic number.

27966971 is a deficient number, since it is larger than the sum of its proper divisors (393973).

27966971 is an equidigital number, since it uses as much as digits as its factorization.

27966971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393972.

The product of its digits is 285768, while the sum is 47.

The square root of 27966971 is about 5288.3807540683. The cubic root of 27966971 is about 303.5394508073.

Subtracting from 27966971 its reverse (17966972), we obtain a palindrome (9999999).

The spelling of 27966971 in words is "twenty-seven million, nine hundred sixty-six thousand, nine hundred seventy-one".