27829681 has 4 divisors (see below), whose sum is σ = 30359664. Its totient is φ = 25299700.

The previous prime is 27829679. The next prime is 27829721. The reversal of 27829681 is 18692872.

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 a cyclic number.

It is not a de Polignac number, because 27829681 - 2¹ = 27829679 is a prime.

It is a super-2 number, since 2×27829681² = 1548982289123522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27829601) 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, 1264975 + ... + 1264996.

It is an arithmetic number, because the mean of its divisors is an integer number (7589916).

Almost surely, 2^27829681 is an apocalyptic number.

It is an amenable number.

27829681 is a deficient number, since it is larger than the sum of its proper divisors (2529983).

27829681 is a wasteful number, since it uses less digits than its factorization.

27829681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529982.

The product of its digits is 96768, while the sum is 43.

The square root of 27829681 is about 5275.3844409673. The cubic root of 27829681 is about 303.0419436030.

The spelling of 27829681 in words is "twenty-seven million, eight hundred twenty-nine thousand, six hundred eighty-one".