640302318 has 24 divisors (see below), whose sum is σ = 1460339400. Its totient is φ = 202200624.

The previous prime is 640302301. The next prime is 640302323. The reversal of 640302318 is 813203046.

It is a happy number.

640302318 is a `hidden beast` number, since 6 + 40 + 302 + 318 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 640302291 and 640302300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 935773 + ... + 936456.

It is an arithmetic number, because the mean of its divisors is an integer number (60847475).

Almost surely, 2^640302318 is an apocalyptic number.

640302318 is an abundant number, since it is smaller than the sum of its proper divisors (820037082).

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

640302318 is a wasteful number, since it uses less digits than its factorization.

640302318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872256 (or 1872253 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 640302318 is about 25304.1956600086. The cubic root of 640302318 is about 861.9095472331.

The spelling of 640302318 in words is "six hundred forty million, three hundred two thousand, three hundred eighteen".