640964352 has 72 divisors (see below), whose sum is σ = 1949616256. Its totient is φ = 183131136.

The previous prime is 640964329. The next prime is 640964353. The reversal of 640964352 is 253469046.

It is a self number, because there is not a number n which added to its sum of digits gives 640964352.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640964353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54238 + ... + 64989.

Almost surely, 2^640964352 is an apocalyptic number.

It is an amenable number.

640964352 is an abundant number, since it is smaller than the sum of its proper divisors (1308651904).

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

640964352 is a wasteful number, since it uses less digits than its factorization.

640964352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119253 (or 119239 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 640964352 is about 25317.2737868831. The cubic root of 640964352 is about 862.2064990854.

The spelling of 640964352 in words is "six hundred forty million, nine hundred sixty-four thousand, three hundred fifty-two".