640413050680 has 64 divisors (see below), whose sum is σ = 1587857816160. Its totient is φ = 230961120768.

The previous prime is 640413050659. The next prime is 640413050687. The reversal of 640413050680 is 86050314046.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640413050687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14298147 + ... + 14342866.

Almost surely, 2^640413050680 is an apocalyptic number.

It is an amenable number.

640413050680 is an abundant number, since it is smaller than the sum of its proper divisors (947444765480).

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

640413050680 is a wasteful number, since it uses less digits than its factorization.

640413050680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28641080 (or 28641076 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 640413050680 in words is "six hundred forty billion, four hundred thirteen million, fifty thousand, six hundred eighty".