27427561 has 16 divisors (see below), whose sum is σ = 32032000. Its totient is φ = 23001408.

The previous prime is 27427549. The next prime is 27427571. The reversal of 27427561 is 16572472.

It is a cyclic number.

It is not a de Polignac number, because 27427561 - 2¹³ = 27419369 is a prime.

It is a super-2 number, since 2×27427561² = 1504542204817442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27427531) 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, 78415 + ... + 78763.

It is an arithmetic number, because the mean of its divisors is an integer number (2002000).

Almost surely, 2^27427561 is an apocalyptic number.

It is an amenable number.

27427561 is a deficient number, since it is larger than the sum of its proper divisors (4604439).

27427561 is a wasteful number, since it uses less digits than its factorization.

27427561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568.

The product of its digits is 23520, while the sum is 34.

The square root of 27427561 is about 5237.1328988293. The cubic root of 27427561 is about 301.5752731630.

The spelling of 27427561 in words is "twenty-seven million, four hundred twenty-seven thousand, five hundred sixty-one".