328252721 has 8 divisors (see below), whose sum is σ = 345808320. Its totient is φ = 310725072.

The previous prime is 328252703. The next prime is 328252723. The reversal of 328252721 is 127252823.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328252721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328252723) 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, 19796 + ... + 32378.

It is an arithmetic number, because the mean of its divisors is an integer number (43226040).

Almost surely, 2^328252721 is an apocalyptic number.

It is an amenable number.

328252721 is a deficient number, since it is larger than the sum of its proper divisors (17555599).

328252721 is a wasteful number, since it uses less digits than its factorization.

328252721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13975.

The product of its digits is 13440, while the sum is 32.

The square root of 328252721 is about 18117.7460242713. The cubic root of 328252721 is about 689.8205239289.

The spelling of 328252721 in words is "three hundred twenty-eight million, two hundred fifty-two thousand, seven hundred twenty-one".