640040572 has 12 divisors (see below), whose sum is σ = 1121548176. Its totient is φ = 319598240.

The previous prime is 640040543. The next prime is 640040581. The reversal of 640040572 is 275040046.

It is a self number, because there is not a number n which added to its sum of digits gives 640040572.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102088 + ... + 108175.

It is an arithmetic number, because the mean of its divisors is an integer number (93462348).

Almost surely, 2^640040572 is an apocalyptic number.

It is an amenable number.

640040572 is a deficient number, since it is larger than the sum of its proper divisors (481507604).

640040572 is a wasteful number, since it uses less digits than its factorization.

640040572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211028 (or 211026 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 640040572 is about 25299.0231431967. The cubic root of 640040572 is about 861.7920859872.

The spelling of 640040572 in words is "six hundred forty million, forty thousand, five hundred seventy-two".