640702896371792 has 60 divisors (see below), whose sum is σ = 1282905850957920. Its totient is φ = 309967181634240.

The previous prime is 640702896371777. The next prime is 640702896371801. The reversal of 640702896371792 is 297173698207046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91381709 + ... + 98142867.

It is an arithmetic number, because the mean of its divisors is an integer number (21381764182632).

Almost surely, 2^{640702896371792} is an apocalyptic number.

640702896371792 is a gapful number since it is divisible by the number (62) 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 640702896371792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (641452925478960).

640702896371792 is an abundant number, since it is smaller than the sum of its proper divisors (642202954586128).

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

640702896371792 is a wasteful number, since it uses less digits than its factorization.

640702896371792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6767392 (or 6767355 counting only the distinct ones).

The product of its (nonzero) digits is 384072192, while the sum is 71.

The spelling of 640702896371792 in words is "six hundred forty trillion, seven hundred two billion, eight hundred ninety-six million, three hundred seventy-one thousand, seven hundred ninety-two".