640334 has 8 divisors (see below), whose sum is σ = 968448. Its totient is φ = 317520.

The previous prime is 640333. The next prime is 640363. The reversal of 640334 is 433046.

640334 = 461² + 462² + 463².

It is a happy number.

640334 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640333) 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, 1007 + ... + 1514.

It is an arithmetic number, because the mean of its divisors is an integer number (121056).

2⁶⁴⁰³³⁴ is an apocalyptic number.

640334 is a deficient number, since it is larger than the sum of its proper divisors (328114).

640334 is a wasteful number, since it uses less digits than its factorization.

640334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 640334 is about 800.2087227718. The cubic root of 640334 is about 86.1923762689.

The spelling of 640334 in words is "six hundred forty thousand, three hundred thirty-four".