640773530760 has 128 divisors (see below), whose sum is σ = 2099580134400. Its totient is φ = 155153621760.

The previous prime is 640773530753. The next prime is 640773530773. The reversal of 640773530760 is 67035377046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 818187 + ... + 1396773.

It is an arithmetic number, because the mean of its divisors is an integer number (16402969800).

Almost surely, 2^640773530760 is an apocalyptic number.

640773530760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640773530760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1049790067200).

640773530760 is an abundant number, since it is smaller than the sum of its proper divisors (1458806603640).

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

640773530760 is a wasteful number, since it uses less digits than its factorization.

640773530760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579451 (or 579447 counting only the distinct ones).

The product of its (nonzero) digits is 2222640, while the sum is 48.

The spelling of 640773530760 in words is "six hundred forty billion, seven hundred seventy-three million, five hundred thirty thousand, seven hundred sixty".