640210672682 has 8 divisors (see below), whose sum is σ = 1097504010336. Its totient is φ = 274376002572.

The previous prime is 640210672667. The next prime is 640210672691. The reversal of 640210672682 is 286276012046.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 22864666868 + ... + 22864666895.

It is an arithmetic number, because the mean of its divisors is an integer number (137188001292).

Almost surely, 2^640210672682 is an apocalyptic number.

640210672682 is a deficient number, since it is larger than the sum of its proper divisors (457293337654).

640210672682 is a wasteful number, since it uses less digits than its factorization.

640210672682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45729333772.

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 640210672682 in words is "six hundred forty billion, two hundred ten million, six hundred seventy-two thousand, six hundred eighty-two".