27983791 has 6 divisors (see below), whose sum is σ = 30759176. Its totient is φ = 25439700.

The previous prime is 27983783. The next prime is 27983797. The reversal of 27983791 is 19738972.

It is a happy number.

It is not a de Polignac number, because 27983791 - 2³ = 27983783 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 (27983797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 115515 + ... + 115756.

Almost surely, 2^27983791 is an apocalyptic number.

27983791 is a deficient number, since it is larger than the sum of its proper divisors (2775385).

27983791 is a wasteful number, since it uses less digits than its factorization.

27983791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231293 (or 231282 counting only the distinct ones).

The product of its digits is 190512, while the sum is 46.

The square root of 27983791 is about 5289.9707938702. The cubic root of 27983791 is about 303.6002905549.

The spelling of 27983791 in words is "twenty-seven million, nine hundred eighty-three thousand, seven hundred ninety-one".