27243681 has 4 divisors (see below), whose sum is σ = 36324912. Its totient is φ = 18162452.

The previous prime is 27243653. The next prime is 27243709. The reversal of 27243681 is 18634272.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (27243653) and next prime (27243709).

It is a cyclic number.

It is not a de Polignac number, because 27243681 - 2⁵ = 27243649 is a prime.

It is a super-2 number, since 2×27243681² = 1484436308859522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27241681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4540611 + ... + 4540616.

It is an arithmetic number, because the mean of its divisors is an integer number (9081228).

Almost surely, 2^27243681 is an apocalyptic number.

It is an amenable number.

27243681 is a deficient number, since it is larger than the sum of its proper divisors (9081231).

27243681 is an equidigital number, since it uses as much as digits as its factorization.

27243681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9081230.

The product of its digits is 16128, while the sum is 33.

The square root of 27243681 is about 5219.5479689337. The cubic root of 27243681 is about 300.8998206001.

The spelling of 27243681 in words is "twenty-seven million, two hundred forty-three thousand, six hundred eighty-one".