640310355 has 48 divisors (see below), whose sum is σ = 1237036320. Its totient is φ = 304487424.

The previous prime is 640310347. The next prime is 640310443. The reversal of 640310355 is 553013046.

640310355 is a `hidden beast` number, since 640 + 3 + 10 + 3 + 5 + 5 = 666.

It is not a de Polignac number, because 640310355 - 2³ = 640310347 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7492 + ... + 36561.

It is an arithmetic number, because the mean of its divisors is an integer number (25771590).

Almost surely, 2^640310355 is an apocalyptic number.

640310355 is a deficient number, since it is larger than the sum of its proper divisors (596725965).

640310355 is a wasteful number, since it uses less digits than its factorization.

640310355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44100 (or 44097 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 640310355 is about 25304.3544671663. The cubic root of 640310355 is about 861.9131534141.

The spelling of 640310355 in words is "six hundred forty million, three hundred ten thousand, three hundred fifty-five".