27691399 has 4 divisors (see below), whose sum is σ = 27893664. Its totient is φ = 27489136.

The previous prime is 27691397. The next prime is 27691403. The reversal of 27691399 is 99319672.

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

It is a cyclic number.

It is not a de Polignac number, because 27691399 - 2¹ = 27691397 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 (27691397) 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, 100927 + ... + 101200.

It is an arithmetic number, because the mean of its divisors is an integer number (6973416).

Almost surely, 2^27691399 is an apocalyptic number.

27691399 is a deficient number, since it is larger than the sum of its proper divisors (202265).

27691399 is a wasteful number, since it uses less digits than its factorization.

27691399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202264.

The product of its digits is 183708, while the sum is 46.

The square root of 27691399 is about 5262.2617760807. The cubic root of 27691399 is about 302.5391848699.

The spelling of 27691399 in words is "twenty-seven million, six hundred ninety-one thousand, three hundred ninety-nine".