640573822 has 16 divisors (see below), whose sum is σ = 1127806560. Its totient is φ = 267111648.

The previous prime is 640573807. The next prime is 640573867. The reversal of 640573822 is 228375046.

It is a Harshad number since it is a multiple of its sum of digits (37).

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, 617797 + ... + 618832.

It is an arithmetic number, because the mean of its divisors is an integer number (70487910).

Almost surely, 2^640573822 is an apocalyptic number.

640573822 is a deficient number, since it is larger than the sum of its proper divisors (487232738).

640573822 is a wasteful number, since it uses less digits than its factorization.

640573822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236675.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 640573822 is about 25309.5598934474. The cubic root of 640573822 is about 862.0313536649.

The spelling of 640573822 in words is "six hundred forty million, five hundred seventy-three thousand, eight hundred twenty-two".