27697797 has 6 divisors (see below), whose sum is σ = 40007942. Its totient is φ = 18465192.

The previous prime is 27697771. The next prime is 27697799. The reversal of 27697797 is 79779672.

It can be written as a sum of positive squares in only one way, i.e., 19368801 + 8328996 = 4401^2 + 2886^2 .

It is not a de Polignac number, because 27697797 - 2⁸ = 27697541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27697799) 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 5 ways as a sum of consecutive naturals, for example, 1538758 + ... + 1538775.

Almost surely, 2^27697797 is an apocalyptic number.

It is an amenable number.

27697797 is a deficient number, since it is larger than the sum of its proper divisors (12310145).

27697797 is a wasteful number, since it uses less digits than its factorization.

27697797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3077539 (or 3077536 counting only the distinct ones).

The product of its digits is 2333772, while the sum is 54.

The square root of 27697797 is about 5262.8696544756. The cubic root of 27697797 is about 302.5624832793.

The spelling of 27697797 in words is "twenty-seven million, six hundred ninety-seven thousand, seven hundred ninety-seven".