27997983 has 24 divisors (see below), whose sum is σ = 44019248. Its totient is φ = 17044992.

The previous prime is 27997973. The next prime is 27997987. The reversal of 27997983 is 38979972.

It is a de Polignac number, because none of the positive numbers 2^k-27997983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27997987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10116 + ... + 12582.

Almost surely, 2^27997983 is an apocalyptic number.

27997983 is a deficient number, since it is larger than the sum of its proper divisors (16021265).

27997983 is a wasteful number, since it uses less digits than its factorization.

27997983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583 (or 2580 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 54.

The square root of 27997983 is about 5291.3120301112. The cubic root of 27997983 is about 303.6516055840.

The spelling of 27997983 in words is "twenty-seven million, nine hundred ninety-seven thousand, nine hundred eighty-three".