328705720 has 96 divisors (see below), whose sum is σ = 890157600. Its totient is φ = 108794112.

The previous prime is 328705711. The next prime is 328705721. The reversal of 328705720 is 27507823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328705721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53949 + ... + 59731.

It is an arithmetic number, because the mean of its divisors is an integer number (9272475).

Almost surely, 2^328705720 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 328705720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (445078800).

328705720 is an abundant number, since it is smaller than the sum of its proper divisors (561451880).

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

328705720 is a wasteful number, since it uses less digits than its factorization.

328705720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5837 (or 5826 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 328705720 is about 18130.2432416115. The cubic root of 328705720 is about 690.1377026857.

The spelling of 328705720 in words is "three hundred twenty-eight million, seven hundred five thousand, seven hundred twenty".