27712561 has 4 divisors (see below), whose sum is σ = 27723124. Its totient is φ = 27702000.

The previous prime is 27712547. The next prime is 27712571. The reversal of 27712561 is 16521772.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 24561936 + 3150625 = 4956^2 + 1775^2 .

It is a cyclic number.

It is not a de Polignac number, because 27712561 - 2¹¹ = 27710513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27712571) 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 3 ways as a sum of consecutive naturals, for example, 2011 + ... + 7711.

It is an arithmetic number, because the mean of its divisors is an integer number (6930781).

Almost surely, 2^27712561 is an apocalyptic number.

It is an amenable number.

27712561 is a deficient number, since it is larger than the sum of its proper divisors (10563).

27712561 is an equidigital number, since it uses as much as digits as its factorization.

27712561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10562.

The product of its digits is 5880, while the sum is 31.

The square root of 27712561 is about 5264.2721244252. The cubic root of 27712561 is about 302.6162329095.

The spelling of 27712561 in words is "twenty-seven million, seven hundred twelve thousand, five hundred sixty-one".