27288681 has 16 divisors (see below), whose sum is σ = 43017600. Its totient is φ = 15055488.

The previous prime is 27288629. The next prime is 27288691. The reversal of 27288681 is 18688272.

It is a de Polignac number, because none of the positive numbers 2^k-27288681 is a prime.

It is a super-2 number, since 2×27288681² = 1489344221439522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27288601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21796 + ... + 23013.

It is an arithmetic number, because the mean of its divisors is an integer number (2688600).

Almost surely, 2^27288681 is an apocalyptic number.

27288681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27288681 is a deficient number, since it is larger than the sum of its proper divisors (15728919).

27288681 is a wasteful number, since it uses less digits than its factorization.

27288681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44848.

The product of its digits is 86016, while the sum is 42.

The square root of 27288681 is about 5223.8569084538. The cubic root of 27288681 is about 301.0654008136.

The spelling of 27288681 in words is "twenty-seven million, two hundred eighty-eight thousand, six hundred eighty-one".