640886140000 has 60 divisors (see below), whose sum is σ = 1576676086524. Its totient is φ = 256354448000.

The previous prime is 640886139983. The next prime is 640886140057. The reversal of 640886140000 is 41688046.

It is a congruent number.

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 9 ways as a sum of consecutive naturals, for example, 16002154 + ... + 16042153.

Almost surely, 2^640886140000 is an apocalyptic number.

It is an amenable number.

640886140000 is an abundant number, since it is smaller than the sum of its proper divisors (935789946524).

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

640886140000 is an equidigital number, since it uses as much as digits as its factorization.

640886140000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32044337 (or 32044314 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 640886140000 in words is "six hundred forty billion, eight hundred eighty-six million, one hundred forty thousand".