328621673 has 4 divisors (see below), whose sum is σ = 328976340. Its totient is φ = 328267008.

The previous prime is 328621637. The next prime is 328621721. The reversal of 328621673 is 376126823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 376126823 = 389 ⋅966907.

It can be written as a sum of positive squares in 2 ways, for example, as 112296409 + 216325264 = 10597^2 + 14708^2 .

It is a cyclic number.

It is not a de Polignac number, because 328621673 - 2²⁴ = 311844457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328621613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175940 + ... + 177797.

It is an arithmetic number, because the mean of its divisors is an integer number (82244085).

Almost surely, 2^328621673 is an apocalyptic number.

It is an amenable number.

328621673 is a deficient number, since it is larger than the sum of its proper divisors (354667).

328621673 is an equidigital number, since it uses as much as digits as its factorization.

328621673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354666.

The product of its digits is 72576, while the sum is 38.

The square root of 328621673 is about 18127.9252260152. The cubic root of 328621673 is about 690.0788770712.

The spelling of 328621673 in words is "three hundred twenty-eight million, six hundred twenty-one thousand, six hundred seventy-three".