27427681 has 4 divisors (see below), whose sum is σ = 29041092. Its totient is φ = 25814272.

The previous prime is 27427669. The next prime is 27427691. The reversal of 27427681 is 18672472.

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 8208225 + 19219456 = 2865^2 + 4384^2 .

It is a cyclic number.

It is not a de Polignac number, because 27427681 - 2¹¹ = 27425633 is a prime.

It is a super-2 number, since 2×27427681² = 1504555370075522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27427681.

It is not an unprimeable number, because it can be changed into a prime (27427651) 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, 806680 + ... + 806713.

It is an arithmetic number, because the mean of its divisors is an integer number (7260273).

Almost surely, 2^27427681 is an apocalyptic number.

It is an amenable number.

27427681 is a deficient number, since it is larger than the sum of its proper divisors (1613411).

27427681 is a wasteful number, since it uses less digits than its factorization.

27427681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613410.

The product of its digits is 37632, while the sum is 37.

The square root of 27427681 is about 5237.1443554670. The cubic root of 27427681 is about 301.5757129758.

The spelling of 27427681 in words is "twenty-seven million, four hundred twenty-seven thousand, six hundred eighty-one".