322640 has 40 divisors (see below), whose sum is σ = 777480. Its totient is φ = 124416.

The previous prime is 322633. The next prime is 322649. The reversal of 322640 is 46223.

It can be written as a sum of positive squares in 4 ways, for example, as 118336 + 204304 = 344^2 + 452^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (322649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2906 + ... + 3014.

It is an arithmetic number, because the mean of its divisors is an integer number (19437).

2³²²⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 322640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (388740).

322640 is an abundant number, since it is smaller than the sum of its proper divisors (454840).

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

322640 is a wasteful number, since it uses less digits than its factorization.

322640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 322640 is about 568.0140843324. The cubic root of 322640 is about 68.5866203113.

Adding to 322640 its reverse (46223), we get a palindrome (368863).

The spelling of 322640 in words is "three hundred twenty-two thousand, six hundred forty".