27666401 has 16 divisors (see below), whose sum is σ = 33177600. Its totient is φ = 22556688.

The previous prime is 27666391. The next prime is 27666403. The reversal of 27666401 is 10466672.

It is not a de Polignac number, because 27666401 - 2¹⁰ = 27665377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27666403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38120 + ... + 38838.

It is an arithmetic number, because the mean of its divisors is an integer number (2073600).

Almost surely, 2^27666401 is an apocalyptic number.

It is an amenable number.

27666401 is a deficient number, since it is larger than the sum of its proper divisors (5511199).

27666401 is a wasteful number, since it uses less digits than its factorization.

27666401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 27666401 is about 5259.8860253812. The cubic root of 27666401 is about 302.4481198736.

The spelling of 27666401 in words is "twenty-seven million, six hundred sixty-six thousand, four hundred one".