640223472680 has 96 divisors (see below), whose sum is σ = 1652204736000. Its totient is φ = 222686386560.

The previous prime is 640223472649. The next prime is 640223472701. The reversal of 640223472680 is 86274322046.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2764280 + ... + 2986919.

It is an arithmetic number, because the mean of its divisors is an integer number (17210466000).

Almost surely, 2^640223472680 is an apocalyptic number.

It is an amenable number.

640223472680 is an abundant number, since it is smaller than the sum of its proper divisors (1011981263320).

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

640223472680 is a wasteful number, since it uses less digits than its factorization.

640223472680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5751255 (or 5751240 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 44.

The spelling of 640223472680 in words is "six hundred forty billion, two hundred twenty-three million, four hundred seventy-two thousand, six hundred eighty".