640326 has 8 divisors (see below), whose sum is σ = 1280664. Its totient is φ = 213440.

The previous prime is 640307. The next prime is 640333. The reversal of 640326 is 623046.

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

640326 is an admirable number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640326.

It is an unprimeable number.

640326 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53355 + ... + 53366.

It is an arithmetic number, because the mean of its divisors is an integer number (160083).

2⁶⁴⁰³²⁶ is an apocalyptic number.

640326 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.

640326 is a wasteful number, since it uses less digits than its factorization.

640326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106726.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 640326 is about 800.2037240603. The cubic root of 640326 is about 86.1920173198.

The spelling of 640326 in words is "six hundred forty thousand, three hundred twenty-six".