640568214 has 48 divisors (see below), whose sum is σ = 1630543824. Its totient is φ = 179179200.

The previous prime is 640568213. The next prime is 640568219. The reversal of 640568214 is 412865046.

640568214 is a `hidden beast` number, since 640 + 5 + 6 + 8 + 2 + 1 + 4 = 666.

640568214 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 not an unprimeable number, because it can be changed into a prime (640568213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121857 + ... + 127004.

It is an arithmetic number, because the mean of its divisors is an integer number (33969663).

Almost surely, 2^640568214 is an apocalyptic number.

640568214 is an abundant number, since it is smaller than the sum of its proper divisors (989975610).

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

640568214 is a wasteful number, since it uses less digits than its factorization.

640568214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248893 (or 248890 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 640568214 is about 25309.4491050279. The cubic root of 640568214 is about 862.0288380631.

The spelling of 640568214 in words is "six hundred forty million, five hundred sixty-eight thousand, two hundred fourteen".