640041446684 has 24 divisors (see below), whose sum is σ = 1135247393280. Its totient is φ = 315708677424.

The previous prime is 640041446647. The next prime is 640041446719. The reversal of 640041446684 is 486644140046.

It is a super-2 number, since 2×640041446684² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2845064 + ... + 3061775.

It is an arithmetic number, because the mean of its divisors is an integer number (47301974720).

Almost surely, 2^640041446684 is an apocalyptic number.

It is an amenable number.

640041446684 is a deficient number, since it is larger than the sum of its proper divisors (495205946596).

640041446684 is a wasteful number, since it uses less digits than its factorization.

640041446684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5907209 (or 5907207 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 47.

The spelling of 640041446684 in words is "six hundred forty billion, forty-one million, four hundred forty-six thousand, six hundred eighty-four".