640684832288 has 18 divisors (see below), whose sum is σ = 1261357177941. Its totient is φ = 320340152192.

The previous prime is 640684832239. The next prime is 640684832299. The reversal of 640684832288 is 882238486046.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 357733179664 + 282951652624 = 598108^2 + 531932^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=565988.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4457156 + ... + 4598652.

Almost surely, 2^640684832288 is an apocalyptic number.

It is an amenable number.

640684832288 is a deficient number, since it is larger than the sum of its proper divisors (620672345653).

640684832288 is an frugal number, since it uses more digits than its factorization.

640684832288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283004 (or 141499 counting only the distinct ones).

The product of its (nonzero) digits is 28311552, while the sum is 59.

The spelling of 640684832288 in words is "six hundred forty billion, six hundred eighty-four million, eight hundred thirty-two thousand, two hundred eighty-eight".