640839334 has 16 divisors (see below), whose sum is σ = 1039201200. Its totient is φ = 295350624.

The previous prime is 640839263. The next prime is 640839373. The reversal of 640839334 is 433938046.

640839334 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, 226489 + ... + 229300.

It is an arithmetic number, because the mean of its divisors is an integer number (64950075).

Almost surely, 2^640839334 is an apocalyptic number.

640839334 is a deficient number, since it is larger than the sum of its proper divisors (398361866).

640839334 is a wasteful number, since it uses less digits than its factorization.

640839334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455847.

The product of its (nonzero) digits is 186624, while the sum is 40.

The square root of 640839334 is about 25314.8046407631. The cubic root of 640839334 is about 862.1504385881.

The spelling of 640839334 in words is "six hundred forty million, eight hundred thirty-nine thousand, three hundred thirty-four".