27688931 has 4 divisors (see below), whose sum is σ = 27771432. Its totient is φ = 27606432.

The previous prime is 27688907. The next prime is 27688951. The reversal of 27688931 is 13988672.

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-27688931 is a prime.

It is a super-2 number, since 2×27688931² = 1533353799845522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27688901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40745 + ... + 41418.

It is an arithmetic number, because the mean of its divisors is an integer number (6942858).

Almost surely, 2^27688931 is an apocalyptic number.

27688931 is a deficient number, since it is larger than the sum of its proper divisors (82501).

27688931 is an equidigital number, since it uses as much as digits as its factorization.

27688931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82500.

The product of its digits is 145152, while the sum is 44.

The square root of 27688931 is about 5262.0272709290. The cubic root of 27688931 is about 302.5301966532.

The spelling of 27688931 in words is "twenty-seven million, six hundred eighty-eight thousand, nine hundred thirty-one".