640644100324 has 12 divisors (see below), whose sum is σ = 1121151483648. Its totient is φ = 320315105000.

The previous prime is 640644100307. The next prime is 640644100339. The reversal of 640644100324 is 423001446046.

It is a self number, because there is not a number n which added to its sum of digits gives 640644100324.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1525912 + ... + 1899919.

It is an arithmetic number, because the mean of its divisors is an integer number (93429290304).

Almost surely, 2^640644100324 is an apocalyptic number.

It is an amenable number.

640644100324 is a deficient number, since it is larger than the sum of its proper divisors (480507383324).

640644100324 is a wasteful number, since it uses less digits than its factorization.

640644100324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3472586 (or 3472584 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

The spelling of 640644100324 in words is "six hundred forty billion, six hundred forty-four million, one hundred thousand, three hundred twenty-four".