27997312 has 32 divisors (see below), whose sum is σ = 63745920. Its totient is φ = 11998464.

The previous prime is 27997297. The next prime is 27997313. The reversal of 27997312 is 21379972.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (27997313) 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, 14728 + ... + 16519.

It is an arithmetic number, because the mean of its divisors is an integer number (1992060).

Almost surely, 2^27997312 is an apocalyptic number.

It is an amenable number.

27997312 is an abundant number, since it is smaller than the sum of its proper divisors (35748608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27997312 is an equidigital number, since it uses as much as digits as its factorization.

27997312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31268 (or 31256 counting only the distinct ones).

The product of its digits is 47628, while the sum is 40.

The square root of 27997312 is about 5291.2486239072. The cubic root of 27997312 is about 303.6491797919.

The spelling of 27997312 in words is "twenty-seven million, nine hundred ninety-seven thousand, three hundred twelve".