27216805 has 24 divisors (see below), whose sum is σ = 41450400. Its totient is φ = 16964640.

The previous prime is 27216799. The next prime is 27216829. The reversal of 27216805 is 50861272.

It is not a de Polignac number, because 27216805 - 2¹¹ = 27214757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2355 + ... + 7744.

It is an arithmetic number, because the mean of its divisors is an integer number (1727100).

Almost surely, 2^27216805 is an apocalyptic number.

It is an amenable number.

27216805 is a deficient number, since it is larger than the sum of its proper divisors (14233595).

27216805 is a wasteful number, since it uses less digits than its factorization.

27216805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10129 (or 10122 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 27216805 is about 5216.9727812209. The cubic root of 27216805 is about 300.8008417541.

The spelling of 27216805 in words is "twenty-seven million, two hundred sixteen thousand, eight hundred five".