32005681 has 4 divisors (see below), whose sum is σ = 32062500. Its totient is φ = 31948864.

The previous prime is 32005669. The next prime is 32005691. The reversal of 32005681 is 18650023.

It is a happy number.

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 18352656 + 13653025 = 4284^2 + 3695^2 .

It is a cyclic number.

It is not a de Polignac number, because 32005681 - 2¹¹ = 32003633 is a prime.

It is a super-2 number, since 2×32005681² = 2048727232547522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (32005601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27556 + ... + 28693.

It is an arithmetic number, because the mean of its divisors is an integer number (8015625).

Almost surely, 2^32005681 is an apocalyptic number.

It is an amenable number.

32005681 is a deficient number, since it is larger than the sum of its proper divisors (56819).

32005681 is an equidigital number, since it uses as much as digits as its factorization.

32005681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56818.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 32005681 is about 5657.3563614112. The cubic root of 32005681 is about 317.4989968348.

The spelling of 32005681 in words is "thirty-two million, five thousand, six hundred eighty-one".