27688397 has 4 divisors (see below), whose sum is σ = 30205536. Its totient is φ = 25171260.

The previous prime is 27688391. The next prime is 27688399. The reversal of 27688397 is 79388672.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27688397 - 2⁶ = 27688333 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 (27688391) 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, 1258553 + ... + 1258574.

It is an arithmetic number, because the mean of its divisors is an integer number (7551384).

Almost surely, 2^27688397 is an apocalyptic number.

It is an amenable number.

27688397 is a deficient number, since it is larger than the sum of its proper divisors (2517139).

27688397 is a wasteful number, since it uses less digits than its factorization.

27688397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2517138.

The product of its digits is 1016064, while the sum is 50.

The square root of 27688397 is about 5261.9765297842. The cubic root of 27688397 is about 302.5282518066.

The spelling of 27688397 in words is "twenty-seven million, six hundred eighty-eight thousand, three hundred ninety-seven".