640316 has 6 divisors (see below), whose sum is σ = 1120560. Its totient is φ = 320156.

The previous prime is 640307. The next prime is 640333. The reversal of 640316 is 613046.

640316 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640316.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80036 + ... + 80043.

It is an arithmetic number, because the mean of its divisors is an integer number (186760).

2⁶⁴⁰³¹⁶ is an apocalyptic number.

It is an amenable number.

640316 is a deficient number, since it is larger than the sum of its proper divisors (480244).

640316 is a wasteful number, since it uses less digits than its factorization.

640316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160083 (or 160081 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 640316 is about 800.1974756271. The cubic root of 640316 is about 86.1915686293.

The spelling of 640316 in words is "six hundred forty thousand, three hundred sixteen".