640163364 has 12 divisors (see below), whose sum is σ = 1493714544. Its totient is φ = 213387784.

The previous prime is 640163357. The next prime is 640163401. The reversal of 640163364 is 463361046.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26673462 + ... + 26673485.

It is an arithmetic number, because the mean of its divisors is an integer number (124476212).

Almost surely, 2^640163364 is an apocalyptic number.

It is an amenable number.

640163364 is an abundant number, since it is smaller than the sum of its proper divisors (853551180).

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

640163364 is a wasteful number, since it uses less digits than its factorization.

640163364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53346954 (or 53346952 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 640163364 is about 25301.4498398807. The cubic root of 640163364 is about 861.8471941641.

The spelling of 640163364 in words is "six hundred forty million, one hundred sixty-three thousand, three hundred sixty-four".