605638881 has 6 divisors (see below), whose sum is σ = 874811730. Its totient is φ = 403759248.

The previous prime is 605638877. The next prime is 605638907. The reversal of 605638881 is 188836506.

605638881 is a `hidden beast` number, since 6 + 0 + 5 + 638 + 8 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 604717281 + 921600 = 24591^2 + 960^2 .

It is not a de Polignac number, because 605638881 - 2² = 605638877 is a prime.

It is a super-2 number, since 2×605638881² = 733596908357864322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (605638841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33646596 + ... + 33646613.

It is an arithmetic number, because the mean of its divisors is an integer number (145801955).

Almost surely, 2^605638881 is an apocalyptic number.

It is an amenable number.

605638881 is a deficient number, since it is larger than the sum of its proper divisors (269172849).

605638881 is a wasteful number, since it uses less digits than its factorization.

605638881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67293215 (or 67293212 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 605638881 is about 24609.7314288474. The cubic root of 605638881 is about 846.0666622521.

The spelling of 605638881 in words is "six hundred five million, six hundred thirty-eight thousand, eight hundred eighty-one".