640326049 has 32 divisors (see below), whose sum is σ = 792207360. Its totient is φ = 510364800.

The previous prime is 640326041. The next prime is 640326083. The reversal of 640326049 is 940623046.

It is not a de Polignac number, because 640326049 - 2³ = 640326041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640326041) 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 31 ways as a sum of consecutive naturals, for example, 146869 + ... + 151165.

It is an arithmetic number, because the mean of its divisors is an integer number (24756480).

Almost surely, 2^640326049 is an apocalyptic number.

It is an amenable number.

640326049 is a deficient number, since it is larger than the sum of its proper divisors (151881311).

640326049 is a wasteful number, since it uses less digits than its factorization.

640326049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4381.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 640326049 is about 25304.6645699958. The cubic root of 640326049 is about 861.9201951839.

The spelling of 640326049 in words is "six hundred forty million, three hundred twenty-six thousand, forty-nine".