27991934 has 8 divisors (see below), whose sum is σ = 42029280. Its totient is φ = 13982176.

The previous prime is 27991907. The next prime is 27991939. The reversal of 27991934 is 43919972.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27991939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4139 + ... + 8550.

It is an arithmetic number, because the mean of its divisors is an integer number (5253660).

Almost surely, 2^27991934 is an apocalyptic number.

27991934 is a deficient number, since it is larger than the sum of its proper divisors (14037346).

27991934 is a wasteful number, since it uses less digits than its factorization.

27991934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13794.

The product of its digits is 122472, while the sum is 44.

The square root of 27991934 is about 5290.7404018719. The cubic root of 27991934 is about 303.6297359031.

The spelling of 27991934 in words is "twenty-seven million, nine hundred ninety-one thousand, nine hundred thirty-four".