27997623 has 32 divisors (see below), whose sum is σ = 44291520. Its totient is φ = 17418240.

The previous prime is 27997591. The next prime is 27997633. The reversal of 27997623 is 32679972.

It is a happy number.

It is not a de Polignac number, because 27997623 - 2⁵ = 27997591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27997633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82911 + ... + 83247.

It is an arithmetic number, because the mean of its divisors is an integer number (1384110).

Almost surely, 2^27997623 is an apocalyptic number.

27997623 is a deficient number, since it is larger than the sum of its proper divisors (16293897).

27997623 is a wasteful number, since it uses less digits than its factorization.

27997623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544 (or 538 counting only the distinct ones).

The product of its digits is 285768, while the sum is 45.

The square root of 27997623 is about 5291.2780119740. The cubic root of 27997623 is about 303.6503041206.

The spelling of 27997623 in words is "twenty-seven million, nine hundred ninety-seven thousand, six hundred twenty-three".