328478531 has 4 divisors (see below), whose sum is σ = 328531200. Its totient is φ = 328425864.

The previous prime is 328478503. The next prime is 328478533. The reversal of 328478531 is 135874823.

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

It is a cyclic number.

It is not a de Polignac number, because 328478531 - 2⁶ = 328478467 is a prime.

It is a super-2 number, since 2×328478531² = 215796290655835922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328478533) 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, 15491 + ... + 29948.

It is an arithmetic number, because the mean of its divisors is an integer number (82132800).

Almost surely, 2^328478531 is an apocalyptic number.

328478531 is a deficient number, since it is larger than the sum of its proper divisors (52669).

328478531 is an equidigital number, since it uses as much as digits as its factorization.

328478531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52668.

The product of its digits is 161280, while the sum is 41.

The square root of 328478531 is about 18123.9766883540. The cubic root of 328478531 is about 689.9786669873.

The spelling of 328478531 in words is "three hundred twenty-eight million, four hundred seventy-eight thousand, five hundred thirty-one".