326959640 has 128 divisors (see below), whose sum is σ = 898128000. Its totient is φ = 104570880.

The previous prime is 326959637. The next prime is 326959643. The reversal of 326959640 is 46959623.

326959640 = 1982² + 1983² + ... + 2061².

It is an interprime number because it is at equal distance from previous prime (326959637) and next prime (326959643).

It is a junction number, because it is equal to n+sod(n) for n = 326959591 and 326959600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (326959643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 709010 + ... + 709470.

It is an arithmetic number, because the mean of its divisors is an integer number (7016625).

Almost surely, 2^326959640 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 326959640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (449064000).

326959640 is an abundant number, since it is smaller than the sum of its proper divisors (571168360).

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

326959640 is a wasteful number, since it uses less digits than its factorization.

326959640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 326959640 is about 18082.0253290388. The cubic root of 326959640 is about 688.9135320510.

The spelling of 326959640 in words is "three hundred twenty-six million, nine hundred fifty-nine thousand, six hundred forty".