640032164 has 6 divisors (see below), whose sum is σ = 1120056294. Its totient is φ = 320016080.

The previous prime is 640032149. The next prime is 640032199. The reversal of 640032164 is 461230046.

It can be written as a sum of positive squares in only one way, i.e., 638572900 + 1459264 = 25270^2 + 1208^2 .

It is an unprimeable number.

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, 80004017 + ... + 80004024.

It is an arithmetic number, because the mean of its divisors is an integer number (186676049).

Almost surely, 2^640032164 is an apocalyptic number.

It is an amenable number.

640032164 is a deficient number, since it is larger than the sum of its proper divisors (480024130).

640032164 is a wasteful number, since it uses less digits than its factorization.

640032164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160008045 (or 160008043 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 640032164 is about 25298.8569702269. The cubic root of 640032164 is about 861.7883122787.

The spelling of 640032164 in words is "six hundred forty million, thirty-two thousand, one hundred sixty-four".