328440181 has 4 divisors (see below), whose sum is σ = 330803200. Its totient is φ = 326077164.

The previous prime is 328440179. The next prime is 328440199. The reversal of 328440181 is 181044823.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 181044823 = 101 ⋅1792523.

It is a cyclic number.

It is not a de Polignac number, because 328440181 - 2¹ = 328440179 is a prime.

It is a super-2 number, since 2×328440181² = 215745904990625522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328440481) 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, 1181301 + ... + 1181578.

It is an arithmetic number, because the mean of its divisors is an integer number (82700800).

Almost surely, 2^328440181 is an apocalyptic number.

It is an amenable number.

328440181 is a deficient number, since it is larger than the sum of its proper divisors (2363019).

328440181 is a wasteful number, since it uses less digits than its factorization.

328440181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363018.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 328440181 is about 18122.9186667049. The cubic root of 328440181 is about 689.9518141804.

The spelling of 328440181 in words is "three hundred twenty-eight million, four hundred forty thousand, one hundred eighty-one".