328561221 has 8 divisors (see below), whose sum is σ = 449921824. Its totient is φ = 213120720.

The previous prime is 328561201. The next prime is 328561229. The reversal of 328561221 is 122165823.

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

It is not a de Polignac number, because 328561221 - 2¹⁴ = 328544837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328561229) 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, 1479895 + ... + 1480116.

It is an arithmetic number, because the mean of its divisors is an integer number (56240228).

Almost surely, 2^328561221 is an apocalyptic number.

It is an amenable number.

328561221 is a deficient number, since it is larger than the sum of its proper divisors (121360603).

328561221 is a wasteful number, since it uses less digits than its factorization.

328561221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2960051.

The product of its digits is 5760, while the sum is 30.

The square root of 328561221 is about 18126.2577770482. The cubic root of 328561221 is about 690.0365597096.

The spelling of 328561221 in words is "three hundred twenty-eight million, five hundred sixty-one thousand, two hundred twenty-one".