640602755930 has 32 divisors (see below), whose sum is σ = 1217962234368. Its totient is φ = 242208388800.

The previous prime is 640602755909. The next prime is 640602755939. The reversal of 640602755930 is 39557206046.

640602755930 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×640602755930² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (640602755939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24015281 + ... + 24041940.

It is an arithmetic number, because the mean of its divisors is an integer number (38061319824).

Almost surely, 2^640602755930 is an apocalyptic number.

640602755930 is a deficient number, since it is larger than the sum of its proper divisors (577359478438).

640602755930 is a wasteful number, since it uses less digits than its factorization.

640602755930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48057302.

The product of its (nonzero) digits is 1360800, while the sum is 47.

The spelling of 640602755930 in words is "six hundred forty billion, six hundred two million, seven hundred fifty-five thousand, nine hundred thirty".