640740060740 has 96 divisors (see below), whose sum is σ = 1452626458080. Its totient is φ = 235999236096.

The previous prime is 640740060739. The next prime is 640740060773. The reversal of 640740060740 is 47060047046.

It can be written as a sum of positive squares in 16 ways, for example, as 4599823684 + 636140237056 = 67822^2 + 797584^2 .

It is a junction number, because it is equal to n+sod(n) for n = 640740060694 and 640740060703.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 315790046 + ... + 315792074.

It is an arithmetic number, because the mean of its divisors is an integer number (15131525605).

Almost surely, 2^640740060740 is an apocalyptic number.

It is an amenable number.

640740060740 is an abundant number, since it is smaller than the sum of its proper divisors (811886397340).

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

640740060740 is a wasteful number, since it uses less digits than its factorization.

640740060740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4441 (or 4439 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 38.

The spelling of 640740060740 in words is "six hundred forty billion, seven hundred forty million, sixty thousand, seven hundred forty".