640334041 has 8 divisors (see below), whose sum is σ = 649944000. Its totient is φ = 630788400.

The previous prime is 640334039. The next prime is 640334083. The reversal of 640334041 is 140433046.

It is a happy number.

640334041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 640334041 - 2¹ = 640334039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640333997 and 640334015.

It is not an unprimeable number, because it can be changed into a prime (640334011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4170 + ... + 36028.

It is an arithmetic number, because the mean of its divisors is an integer number (81243000).

Almost surely, 2^640334041 is an apocalyptic number.

It is an amenable number.

640334041 is a deficient number, since it is larger than the sum of its proper divisors (9609959).

640334041 is a wasteful number, since it uses less digits than its factorization.

640334041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32159.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 640334041 is about 25304.8224850521. The cubic root of 640334041 is about 861.9237810850.

Adding to 640334041 its reverse (140433046), we get a palindrome (780767087).

The spelling of 640334041 in words is "six hundred forty million, three hundred thirty-four thousand, forty-one".