328999813 has 4 divisors (see below), whose sum is σ = 329064460. Its totient is φ = 328935168.

The previous prime is 328999777. The next prime is 328999829. The reversal of 328999813 is 318999823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 318999823 = 16333 ⋅19531.

It can be written as a sum of positive squares in 2 ways, for example, as 61121124 + 267878689 = 7818^2 + 16367^2 .

It is a cyclic number.

It is not a de Polignac number, because 328999813 - 2¹⁷ = 328868741 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 (328991813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23970 + ... + 35107.

It is an arithmetic number, because the mean of its divisors is an integer number (82266115).

Almost surely, 2^328999813 is an apocalyptic number.

It is an amenable number.

328999813 is a deficient number, since it is larger than the sum of its proper divisors (64647).

328999813 is an equidigital number, since it uses as much as digits as its factorization.

328999813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64646.

The product of its digits is 839808, while the sum is 52.

The square root of 328999813 is about 18138.3519923945. The cubic root of 328999813 is about 690.3434633953.

The spelling of 328999813 in words is "three hundred twenty-eight million, nine hundred ninety-nine thousand, eight hundred thirteen".