328520872417 has 4 divisors (see below), whose sum is σ = 347845629636. Its totient is φ = 309196115200.

The previous prime is 328520872369. The next prime is 328520872423. The reversal of 328520872417 is 714278025823.

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 118302290401 + 210218582016 = 343951^2 + 458496^2 .

It is a cyclic number.

It is not a de Polignac number, because 328520872417 - 2¹⁵ = 328520839649 is a prime.

It is a super-2 number, since 2×328520872417² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328520872457) 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, 9662378584 + ... + 9662378617.

It is an arithmetic number, because the mean of its divisors is an integer number (86961407409).

Almost surely, 2^328520872417 is an apocalyptic number.

It is an amenable number.

328520872417 is a deficient number, since it is larger than the sum of its proper divisors (19324757219).

328520872417 is a wasteful number, since it uses less digits than its factorization.

328520872417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19324757218.

The product of its (nonzero) digits is 1505280, while the sum is 49.

The spelling of 328520872417 in words is "three hundred twenty-eight billion, five hundred twenty million, eight hundred seventy-two thousand, four hundred seventeen".