640630316 has 12 divisors (see below), whose sum is σ = 1169846832. Its totient is φ = 306388368.

The previous prime is 640630313. The next prime is 640630327. The reversal of 640630316 is 613036046.

It is not an unprimeable number, because it can be changed into a prime (640630313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3481595 + ... + 3481778.

It is an arithmetic number, because the mean of its divisors is an integer number (97487236).

Almost surely, 2^640630316 is an apocalyptic number.

It is an amenable number.

640630316 is a deficient number, since it is larger than the sum of its proper divisors (529216516).

640630316 is a wasteful number, since it uses less digits than its factorization.

640630316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6963400 (or 6963398 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 640630316 is about 25310.6759293386. The cubic root of 640630316 is about 862.0566945734.

The spelling of 640630316 in words is "six hundred forty million, six hundred thirty thousand, three hundred sixteen".