27931329 has 12 divisors (see below), whose sum is σ = 40914432. Its totient is φ = 18358200.

The previous prime is 27931327. The next prime is 27931363. The reversal of 27931329 is 92313972.

It is not a de Polignac number, because 27931329 - 2¹ = 27931327 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 27931293 and 27931302.

It is not an unprimeable number, because it can be changed into a prime (27931327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21217 + ... + 22494.

It is an arithmetic number, because the mean of its divisors is an integer number (3409536).

Almost surely, 2^27931329 is an apocalyptic number.

It is an amenable number.

27931329 is a deficient number, since it is larger than the sum of its proper divisors (12983103).

27931329 is a wasteful number, since it uses less digits than its factorization.

27931329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43788 (or 43785 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 27931329 is about 5285.0098391583. The cubic root of 27931329 is about 303.4104492041.

The spelling of 27931329 in words is "twenty-seven million, nine hundred thirty-one thousand, three hundred twenty-nine".