328720172 has 24 divisors (see below), whose sum is σ = 635124672. Its totient is φ = 147616400.

The previous prime is 328720153. The next prime is 328720237. The reversal of 328720172 is 271027823.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41354 + ... + 48657.

It is an arithmetic number, because the mean of its divisors is an integer number (26463528).

Almost surely, 2^328720172 is an apocalyptic number.

It is an amenable number.

328720172 is a deficient number, since it is larger than the sum of its proper divisors (306404500).

328720172 is a wasteful number, since it uses less digits than its factorization.

328720172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90109 (or 90107 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 328720172 is about 18130.6417977963. The cubic root of 328720172 is about 690.1478168226.

Adding to 328720172 its reverse (271027823), we get a palindrome (599747995).

The spelling of 328720172 in words is "three hundred twenty-eight million, seven hundred twenty thousand, one hundred seventy-two".