640730327633540 has 24 divisors (see below), whose sum is σ = 1364484866738112. Its totient is φ = 252682382728160.

The previous prime is 640730327633497. The next prime is 640730327633573. The reversal of 640730327633540 is 45336723037046.

640730327633540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 225609268874 + ... + 225609271713.

It is an arithmetic number, because the mean of its divisors is an integer number (56853536114088).

Almost surely, 2^{640730327633540} is an apocalyptic number.

It is an amenable number.

640730327633540 is an abundant number, since it is smaller than the sum of its proper divisors (723754539104572).

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

640730327633540 is a wasteful number, since it uses less digits than its factorization.

640730327633540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451218540667 (or 451218540665 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 53.

The spelling of 640730327633540 in words is "six hundred forty trillion, seven hundred thirty billion, three hundred twenty-seven million, six hundred thirty-three thousand, five hundred forty".