27506561 has 4 divisors (see below), whose sum is σ = 29124612. Its totient is φ = 25888512.

The previous prime is 27506543. The next prime is 27506569. The reversal of 27506561 is 16560572.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25816561 + 1690000 = 5081^2 + 1300^2 .

It is a cyclic number.

It is not a de Polignac number, because 27506561 - 2⁶ = 27506497 is a prime.

It is a super-2 number, since 2×27506561² = 1513221796093442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27506569) 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, 809000 + ... + 809033.

It is an arithmetic number, because the mean of its divisors is an integer number (7281153).

Almost surely, 2^27506561 is an apocalyptic number.

It is an amenable number.

27506561 is a deficient number, since it is larger than the sum of its proper divisors (1618051).

27506561 is a wasteful number, since it uses less digits than its factorization.

27506561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618050.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 27506561 is about 5244.6697703478. The cubic root of 27506561 is about 301.8645394858.

The spelling of 27506561 in words is "twenty-seven million, five hundred six thousand, five hundred sixty-one".