640040334 has 16 divisors (see below), whose sum is σ = 1284453072. Its totient is φ = 212618048.

The previous prime is 640040321. The next prime is 640040369. The reversal of 640040334 is 433040046.

640040334 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 unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180279 + ... + 183794.

It is an arithmetic number, because the mean of its divisors is an integer number (80278317).

Almost surely, 2^640040334 is an apocalyptic number.

640040334 is an abundant number, since it is smaller than the sum of its proper divisors (644412738).

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

640040334 is a wasteful number, since it uses less digits than its factorization.

640040334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364371.

The product of its (nonzero) digits is 3456, while the sum is 24.

The square root of 640040334 is about 25299.0184394573. The cubic root of 640040334 is about 861.7919791676.

The spelling of 640040334 in words is "six hundred forty million, forty thousand, three hundred thirty-four".