640575468 has 72 divisors (see below), whose sum is σ = 1750353696. Its totient is φ = 196358400.

The previous prime is 640575401. The next prime is 640575473. The reversal of 640575468 is 864575046.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129073 + ... + 133943.

It is an arithmetic number, because the mean of its divisors is an integer number (24310468).

Almost surely, 2^640575468 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640575468, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (875176848).

640575468 is an abundant number, since it is smaller than the sum of its proper divisors (1109778228).

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

640575468 is a wasteful number, since it uses less digits than its factorization.

640575468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5175 (or 5170 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The square root of 640575468 is about 25309.5924107837. The cubic root of 640575468 is about 862.0320920146.

The spelling of 640575468 in words is "six hundred forty million, five hundred seventy-five thousand, four hundred sixty-eight".