640216374 has 32 divisors (see below), whose sum is σ = 1464103680. Its totient is φ = 182824992.

The previous prime is 640216361. The next prime is 640216397. The reversal of 640216374 is 473612046.

It is a happy number.

640216374 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149637 + ... + 153855.

It is an arithmetic number, because the mean of its divisors is an integer number (45753240).

Almost surely, 2^640216374 is an apocalyptic number.

640216374 is an abundant number, since it is smaller than the sum of its proper divisors (823887306).

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

640216374 is a wasteful number, since it uses less digits than its factorization.

640216374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7844.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 640216374 is about 25302.4973866217. The cubic root of 640216374 is about 861.8709824976.

The spelling of 640216374 in words is "six hundred forty million, two hundred sixteen thousand, three hundred seventy-four".