328402813 has 4 divisors (see below), whose sum is σ = 331654428. Its totient is φ = 325151200.

The previous prime is 328402801. The next prime is 328402829. The reversal of 328402813 is 318204823.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 141205689 + 187197124 = 11883^2 + 13682^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328402813 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 (328402843) 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, 1625656 + ... + 1625857.

It is an arithmetic number, because the mean of its divisors is an integer number (82913607).

Almost surely, 2^328402813 is an apocalyptic number.

It is an amenable number.

328402813 is a deficient number, since it is larger than the sum of its proper divisors (3251615).

328402813 is a wasteful number, since it uses less digits than its factorization.

328402813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251614.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 328402813 is about 18121.8876776124. The cubic root of 328402813 is about 689.9256469626.

It can be divided in two parts, 32840 and 2813, that added together give a palindrome (35653).

The spelling of 328402813 in words is "three hundred twenty-eight million, four hundred two thousand, eight hundred thirteen".