640949524 has 12 divisors (see below), whose sum is σ = 1121848000. Its totient is φ = 320421528.

The previous prime is 640949497. The next prime is 640949527. The reversal of 640949524 is 425949046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640949527) 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, 28087 + ... + 45505.

Almost surely, 2^640949524 is an apocalyptic number.

It is an amenable number.

640949524 is a deficient number, since it is larger than the sum of its proper divisors (480898476).

640949524 is a wasteful number, since it uses less digits than its factorization.

640949524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26622 (or 26620 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 640949524 is about 25316.9809416526. The cubic root of 640949524 is about 862.1998503035.

The spelling of 640949524 in words is "six hundred forty million, nine hundred forty-nine thousand, five hundred twenty-four".