640654644304 has 40 divisors (see below), whose sum is σ = 1320955763688. Its totient is φ = 299954135040.

The previous prime is 640654644277. The next prime is 640654644307. The reversal of 640654644304 is 403446456046.

It can be written as a sum of positive squares in 4 ways, for example, as 536614851600 + 104039792704 = 732540^2 + 322552^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640654644307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5924457 + ... + 6031624.

Almost surely, 2^640654644304 is an apocalyptic number.

It is an amenable number.

640654644304 is an abundant number, since it is smaller than the sum of its proper divisors (680301119384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640654644304 is a wasteful number, since it uses less digits than its factorization.

640654644304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11956303 (or 11956297 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 46.

The spelling of 640654644304 in words is "six hundred forty billion, six hundred fifty-four million, six hundred forty-four thousand, three hundred four".