640334334 has 8 divisors (see below), whose sum is σ = 1280668680. Its totient is φ = 213444776.

The previous prime is 640334311. The next prime is 640334339. The reversal of 640334334 is 433433046.

It is a sphenic number, since it is the product of 3 distinct primes.

640334334 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640334339) 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, 53361189 + ... + 53361200.

It is an arithmetic number, because the mean of its divisors is an integer number (160083585).

Almost surely, 2^640334334 is an apocalyptic number.

640334334 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640334334 is a wasteful number, since it uses less digits than its factorization.

640334334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106722394.

The product of its (nonzero) digits is 31104, while the sum is 30.

The square root of 640334334 is about 25304.8282744618. The cubic root of 640334334 is about 861.9239125495.

The spelling of 640334334 in words is "six hundred forty million, three hundred thirty-four thousand, three hundred thirty-four".