640603064 has 16 divisors (see below), whose sum is σ = 1206118320. Its totient is φ = 318971520.

The previous prime is 640603063. The next prime is 640603099. The reversal of 640603064 is 460306046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640603063) 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, 164204 + ... + 168059.

It is an arithmetic number, because the mean of its divisors is an integer number (75382395).

Almost surely, 2^640603064 is an apocalyptic number.

It is an amenable number.

640603064 is a deficient number, since it is larger than the sum of its proper divisors (565515256).

640603064 is a wasteful number, since it uses less digits than its factorization.

640603064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332510 (or 332506 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 640603064 is about 25310.1375737075. The cubic root of 640603064 is about 862.0444706216.

The spelling of 640603064 in words is "six hundred forty million, six hundred three thousand, sixty-four".