27697431 has 4 divisors (see below), whose sum is σ = 36929912. Its totient is φ = 18464952.

The previous prime is 27697393. The next prime is 27697447. The reversal of 27697431 is 13479672.

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

It is not a de Polignac number, because 27697431 - 2⁶ = 27697367 is a prime.

It is a super-2 number, since 2×27697431² = 1534295367999522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27697431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27697931) 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, 4616236 + ... + 4616241.

It is an arithmetic number, because the mean of its divisors is an integer number (9232478).

Almost surely, 2^27697431 is an apocalyptic number.

27697431 is a deficient number, since it is larger than the sum of its proper divisors (9232481).

27697431 is an equidigital number, since it uses as much as digits as its factorization.

27697431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9232480.

The product of its digits is 63504, while the sum is 39.

The square root of 27697431 is about 5262.8348824564. The cubic root of 27697431 is about 302.5611505818.

The spelling of 27697431 in words is "twenty-seven million, six hundred ninety-seven thousand, four hundred thirty-one".