328391172 has 120 divisors (see below), whose sum is σ = 891152416. Its totient is φ = 105815808.

The previous prime is 328391143. The next prime is 328391183. The reversal of 328391172 is 271193823.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3385428 + ... + 3385524.

Almost surely, 2^328391172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 328391172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (445576208).

328391172 is an abundant number, since it is smaller than the sum of its proper divisors (562761244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

328391172 is an frugal number, since it uses more digits than its factorization.

328391172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 145 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 328391172 is about 18121.5664885793. The cubic root of 328391172 is about 689.9174948609.

The spelling of 328391172 in words is "three hundred twenty-eight million, three hundred ninety-one thousand, one hundred seventy-two".