27667661 has 16 divisors (see below), whose sum is σ = 32659200. Its totient is φ = 22945920.

The previous prime is 27667621. The next prime is 27667669. The reversal of 27667661 is 16676672.

It is a cyclic number.

It is not a de Polignac number, because 27667661 - 2¹⁰ = 27666637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27667669) 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, 42440 + ... + 43086.

It is an arithmetic number, because the mean of its divisors is an integer number (2041200).

Almost surely, 2^27667661 is an apocalyptic number.

It is an amenable number.

27667661 is a deficient number, since it is larger than the sum of its proper divisors (4991539).

27667661 is a wasteful number, since it uses less digits than its factorization.

27667661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844.

The product of its digits is 127008, while the sum is 41.

The square root of 27667661 is about 5260.0057984759. The cubic root of 27667661 is about 302.4527112291.

The spelling of 27667661 in words is "twenty-seven million, six hundred sixty-seven thousand, six hundred sixty-one".