640832672739 has 24 divisors (see below), whose sum is σ = 1001770917888. Its totient is φ = 363306701520.

The previous prime is 640832672723. The next prime is 640832672743. The reversal of 640832672739 is 937276238046.

640832672739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640832672739 - 2⁴ = 640832672723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640832672939) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17144347 + ... + 17181684.

It is an arithmetic number, because the mean of its divisors is an integer number (41740454912).

Almost surely, 2^640832672739 is an apocalyptic number.

640832672739 is a deficient number, since it is larger than the sum of its proper divisors (360938245149).

640832672739 is a wasteful number, since it uses less digits than its factorization.

640832672739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34326175 (or 34326168 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 57.

The spelling of 640832672739 in words is "six hundred forty billion, eight hundred thirty-two million, six hundred seventy-two thousand, seven hundred thirty-nine".