605440090 has 8 divisors (see below), whose sum is σ = 1089792180. Its totient is φ = 242176032.

The previous prime is 605440039. The next prime is 605440093. The reversal of 605440090 is 90044506.

605440090 = 11002² + 11003² + ... + 11006².

It can be written as a sum of positive squares in 2 ways, for example, as 548543241 + 56896849 = 23421^2 + 7543^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (605440093) 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 3 ways as a sum of consecutive naturals, for example, 30271995 + ... + 30272014.

Almost surely, 2^605440090 is an apocalyptic number.

605440090 is a deficient number, since it is larger than the sum of its proper divisors (484352090).

605440090 is a wasteful number, since it uses less digits than its factorization.

605440090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60544016.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 605440090 is about 24605.6922276127. The cubic root of 605440090 is about 845.9740829674.

Adding to 605440090 its reverse (90044506), we get a palindrome (695484596).

The spelling of 605440090 in words is "six hundred five million, four hundred forty thousand, ninety".