640064176 has 10 divisors (see below), whose sum is σ = 1240124372. Its totient is φ = 320032080.

The previous prime is 640064167. The next prime is 640064179. The reversal of 640064176 is 671460046.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (640064179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20001990 + ... + 20002021.

Almost surely, 2^640064176 is an apocalyptic number.

It is an amenable number.

640064176 is a deficient number, since it is larger than the sum of its proper divisors (600060196).

640064176 is a wasteful number, since it uses less digits than its factorization.

640064176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40004019 (or 40004013 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 640064176 is about 25299.4896391212. The cubic root of 640064176 is about 861.8026798418.

The spelling of 640064176 in words is "six hundred forty million, sixty-four thousand, one hundred seventy-six".