640208817030 has 64 divisors (see below), whose sum is σ = 1555456608000. Its totient is φ = 168628997760.

The previous prime is 640208817023. The next prime is 640208817047. The reversal of 640208817030 is 30718802046.

640208817030 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 640208817030.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 400065 + ... + 1200195.

It is an arithmetic number, because the mean of its divisors is an integer number (24304009500).

Almost surely, 2^640208817030 is an apocalyptic number.

It is a pronic number, being equal to 800130×800131.

640208817030 is an abundant number, since it is smaller than the sum of its proper divisors (915247790970).

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

640208817030 is a wasteful number, since it uses less digits than its factorization.

640208817030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800469.

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 640208817030 in words is "six hundred forty billion, two hundred eight million, eight hundred seventeen thousand, thirty".