640686185230 has 48 divisors (see below), whose sum is σ = 1444712159520. Its totient is φ = 202766614848.

The previous prime is 640686185197. The next prime is 640686185281. The reversal of 640686185230 is 32581686046.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50282970 + ... + 50295709.

It is an arithmetic number, because the mean of its divisors is an integer number (30098169990).

Almost surely, 2^640686185230 is an apocalyptic number.

640686185230 is an abundant number, since it is smaller than the sum of its proper divisors (804025974290).

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

640686185230 is a wasteful number, since it uses less digits than its factorization.

640686185230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100578713 (or 100578706 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 640686185230 in words is "six hundred forty billion, six hundred eighty-six million, one hundred eighty-five thousand, two hundred thirty".