27729731 has 2 divisors, whose sum is σ = 27729732. Its totient is φ = 27729730.

The previous prime is 27729677. The next prime is 27729739. The reversal of 27729731 is 13792772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27729731 - 2¹⁰ = 27728707 is a prime.

It is a super-2 number, since 2×27729731² = 1537875962664722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27729739) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13864865 + 13864866.

It is an arithmetic number, because the mean of its divisors is an integer number (13864866).

Almost surely, 2^27729731 is an apocalyptic number.

27729731 is a deficient number, since it is larger than the sum of its proper divisors (1).

27729731 is an equidigital number, since it uses as much as digits as its factorization.

27729731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37044, while the sum is 38.

The square root of 27729731 is about 5265.9026766548. The cubic root of 27729731 is about 302.6787177878.

The spelling of 27729731 in words is "twenty-seven million, seven hundred twenty-nine thousand, seven hundred thirty-one".