640576464 has 40 divisors (see below), whose sum is σ = 1805262432. Its totient is φ = 194113920.

The previous prime is 640576463. The next prime is 640576493. The reversal of 640576464 is 464675046.

It is a happy number.

640576464 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640576463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 606079 + ... + 607134.

Almost surely, 2^640576464 is an apocalyptic number.

It is an amenable number.

640576464 is an abundant number, since it is smaller than the sum of its proper divisors (1164685968).

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

640576464 is a wasteful number, since it uses less digits than its factorization.

640576464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213235 (or 1213229 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 42.

The square root of 640576464 is about 25309.6120871103. The cubic root of 640576464 is about 862.0325387918.

The spelling of 640576464 in words is "six hundred forty million, five hundred seventy-six thousand, four hundred sixty-four".