328749321 has 8 divisors (see below), whose sum is σ = 441022240. Its totient is φ = 217821312.

The previous prime is 328749299. The next prime is 328749331. The reversal of 328749321 is 123947823.

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

It is not a de Polignac number, because 328749321 - 2⁹ = 328748809 is a prime.

It is a super-2 number, since 2×328749321² = 216152232115922082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 328749321.

It is not an unprimeable number, because it can be changed into a prime (328749331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335656 + ... + 336633.

It is an arithmetic number, because the mean of its divisors is an integer number (55127780).

Almost surely, 2^328749321 is an apocalyptic number.

It is an amenable number.

328749321 is a deficient number, since it is larger than the sum of its proper divisors (112272919).

328749321 is a wasteful number, since it uses less digits than its factorization.

328749321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672455.

The product of its digits is 72576, while the sum is 39.

The square root of 328749321 is about 18131.4456401027. The cubic root of 328749321 is about 690.1682156560.

It can be divided in two parts, 32874 and 9321, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 328749321 in words is "three hundred twenty-eight million, seven hundred forty-nine thousand, three hundred twenty-one".