640680440300 has 72 divisors (see below), whose sum is σ = 1398090204000. Its totient is φ = 254833413120.

The previous prime is 640680440299. The next prime is 640680440329. The reversal of 640680440300 is 3044086046.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37264106 + ... + 37281294.

It is an arithmetic number, because the mean of its divisors is an integer number (19417919500).

Almost surely, 2^640680440300 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640680440300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (699045102000).

640680440300 is an abundant number, since it is smaller than the sum of its proper divisors (757409763700).

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

640680440300 is a wasteful number, since it uses less digits than its factorization.

640680440300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19275 (or 19268 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 35.

The spelling of 640680440300 in words is "six hundred forty billion, six hundred eighty million, four hundred forty thousand, three hundred".