640804524 has 12 divisors (see below), whose sum is σ = 1495210584. Its totient is φ = 213601504.

The previous prime is 640804481. The next prime is 640804529. The reversal of 640804524 is 425408046.

640804524 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (640804529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26700177 + ... + 26700200.

It is an arithmetic number, because the mean of its divisors is an integer number (124600882).

Almost surely, 2^640804524 is an apocalyptic number.

It is an amenable number.

640804524 is an abundant number, since it is smaller than the sum of its proper divisors (854406060).

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

640804524 is a wasteful number, since it uses less digits than its factorization.

640804524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53400384 (or 53400382 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 640804524 is about 25314.1170890869. The cubic root of 640804524 is about 862.1348278109.

The spelling of 640804524 in words is "six hundred forty million, eight hundred four thousand, five hundred twenty-four".