640576064 has 28 divisors (see below), whose sum is σ = 1312151808. Its totient is φ = 309955200.

The previous prime is 640576061. The next prime is 640576081. The reversal of 640576064 is 460675046.

It is not an unprimeable number, because it can be changed into a prime (640576061) 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, 159452 + ... + 163419.

Almost surely, 2^640576064 is an apocalyptic number.

640576064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

640576064 is an abundant number, since it is smaller than the sum of its proper divisors (671575744).

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

640576064 is a wasteful number, since it uses less digits than its factorization.

640576064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322914 (or 322904 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 640576064 is about 25309.6041849729. The cubic root of 640576064 is about 862.0323593632.

The spelling of 640576064 in words is "six hundred forty million, five hundred seventy-six thousand, sixty-four".