640464406204 has 24 divisors (see below), whose sum is σ = 1281723031008. Its totient is φ = 274314555840.

The previous prime is 640464406171. The next prime is 640464406249. The reversal of 640464406204 is 402604464046.

It is a happy number.

It is a super-2 number, since 2×640464406204² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7045267 + ... + 7135594.

It is an arithmetic number, because the mean of its divisors is an integer number (53405126292).

Almost surely, 2^640464406204 is an apocalyptic number.

It is an amenable number.

640464406204 is an abundant number, since it is smaller than the sum of its proper divisors (641258624804).

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

640464406204 is a wasteful number, since it uses less digits than its factorization.

640464406204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14182485 (or 14182483 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 40.

The spelling of 640464406204 in words is "six hundred forty billion, four hundred sixty-four million, four hundred six thousand, two hundred four".