640236784832 has 14 divisors (see below), whose sum is σ = 1270469870028. Its totient is φ = 320118392384.

The previous prime is 640236784807. The next prime is 640236784867. The reversal of 640236784832 is 238487632046.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5001849818 + ... + 5001849945.

Almost surely, 2^640236784832 is an apocalyptic number.

It is an amenable number.

640236784832 is a deficient number, since it is larger than the sum of its proper divisors (630233085196).

640236784832 is a wasteful number, since it uses less digits than its factorization.

640236784832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10003699775 (or 10003699765 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 53.

The spelling of 640236784832 in words is "six hundred forty billion, two hundred thirty-six million, seven hundred eighty-four thousand, eight hundred thirty-two".