27540561 has 16 divisors (see below), whose sum is σ = 39832128. Its totient is φ = 16857600.

The previous prime is 27540559. The next prime is 27540563. The reversal of 27540561 is 16504572.

It is an interprime number because it is at equal distance from previous prime (27540559) and next prime (27540563).

It is not a de Polignac number, because 27540561 - 2¹ = 27540559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27540563) 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 15 ways as a sum of consecutive naturals, for example, 4495 + ... + 8676.

It is an arithmetic number, because the mean of its divisors is an integer number (2489508).

Almost surely, 2^27540561 is an apocalyptic number.

It is an amenable number.

27540561 is a deficient number, since it is larger than the sum of its proper divisors (12291567).

27540561 is a wasteful number, since it uses less digits than its factorization.

27540561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13232.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 27540561 is about 5247.9101554809. The cubic root of 27540561 is about 301.9888633819.

The spelling of 27540561 in words is "twenty-seven million, five hundred forty thousand, five hundred sixty-one".