27666731 has 2 divisors, whose sum is σ = 27666732. Its totient is φ = 27666730.

The previous prime is 27666721. The next prime is 27666757. The reversal of 27666731 is 13766672.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27666731 is a prime.

It is a super-2 number, since 2×27666731² = 1530896008452722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27666721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13833365 + 13833366.

It is an arithmetic number, because the mean of its divisors is an integer number (13833366).

Almost surely, 2^27666731 is an apocalyptic number.

27666731 is a deficient number, since it is larger than the sum of its proper divisors (1).

27666731 is an equidigital number, since it uses as much as digits as its factorization.

27666731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 38.

The square root of 27666731 is about 5259.9173947886. The cubic root of 27666731 is about 302.4493223850.

The spelling of 27666731 in words is "twenty-seven million, six hundred sixty-six thousand, seven hundred thirty-one".