640579332 has 12 divisors (see below), whose sum is σ = 1494685136. Its totient is φ = 213526440.

The previous prime is 640579327. The next prime is 640579333. The reversal of 640579332 is 233975046.

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 (640579333) 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, 26690794 + ... + 26690817.

Almost surely, 2^640579332 is an apocalyptic number.

It is an amenable number.

640579332 is an abundant number, since it is smaller than the sum of its proper divisors (854105804).

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

640579332 is a wasteful number, since it uses less digits than its factorization.

640579332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53381618 (or 53381616 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 39.

The square root of 640579332 is about 25309.6687453629. The cubic root of 640579332 is about 862.0338252922.

The spelling of 640579332 in words is "six hundred forty million, five hundred seventy-nine thousand, three hundred thirty-two".