640604572615220 has 48 divisors (see below), whose sum is σ = 1349504518699008. Its totient is φ = 255435895075200.

The previous prime is 640604572615193. The next prime is 640604572615243. The reversal of 640604572615220 is 22516275406046.

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 15 ways as a sum of consecutive naturals, for example, 8095631 + ... + 36698070.

It is an arithmetic number, because the mean of its divisors is an integer number (28114677472896).

Almost surely, 2^{640604572615220} is an apocalyptic number.

It is an amenable number.

640604572615220 is an abundant number, since it is smaller than the sum of its proper divisors (708899946083788).

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

640604572615220 is a wasteful number, since it uses less digits than its factorization.

640604572615220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44795960 (or 44795958 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 50.

The spelling of 640604572615220 in words is "six hundred forty trillion, six hundred four billion, five hundred seventy-two million, six hundred fifteen thousand, two hundred twenty".