27138561 has 8 divisors (see below), whose sum is σ = 36343680. Its totient is φ = 18012912.

The previous prime is 27138557. The next prime is 27138569. The reversal of 27138561 is 16583172.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27138561 - 2² = 27138557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27138569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19065 + ... + 20438.

It is an arithmetic number, because the mean of its divisors is an integer number (4542960).

Almost surely, 2^27138561 is an apocalyptic number.

It is an amenable number.

27138561 is a deficient number, since it is larger than the sum of its proper divisors (9205119).

27138561 is a wasteful number, since it uses less digits than its factorization.

27138561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39735.

The product of its digits is 10080, while the sum is 33.

The square root of 27138561 is about 5209.4683989828. The cubic root of 27138561 is about 300.5123135071.

The spelling of 27138561 in words is "twenty-seven million, one hundred thirty-eight thousand, five hundred sixty-one".