640555030 has 8 divisors (see below), whose sum is σ = 1152999072. Its totient is φ = 256222008.

The previous prime is 640555009. The next prime is 640555031. The reversal of 640555030 is 30555046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 640555030.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640555031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32027742 + ... + 32027761.

It is an arithmetic number, because the mean of its divisors is an integer number (144124884).

Almost surely, 2^640555030 is an apocalyptic number.

640555030 is a deficient number, since it is larger than the sum of its proper divisors (512444042).

640555030 is a wasteful number, since it uses less digits than its factorization.

640555030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64055510.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 640555030 is about 25309.1886476039. The cubic root of 640555030 is about 862.0229240085.

The spelling of 640555030 in words is "six hundred forty million, five hundred fifty-five thousand, thirty".