640003164 has 12 divisors (see below), whose sum is σ = 1493340744. Its totient is φ = 213334384.

The previous prime is 640003151. The next prime is 640003193. The reversal of 640003164 is 461300046.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26666787 + ... + 26666810.

It is an arithmetic number, because the mean of its divisors is an integer number (124445062).

Almost surely, 2^640003164 is an apocalyptic number.

It is an amenable number.

640003164 is an abundant number, since it is smaller than the sum of its proper divisors (853337580).

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

640003164 is a wasteful number, since it uses less digits than its factorization.

640003164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53333604 (or 53333602 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 640003164 is about 25298.2838153105. The cubic root of 640003164 is about 861.7752961419.

The spelling of 640003164 in words is "six hundred forty million, three thousand, one hundred sixty-four".