328287221613 has 24 divisors (see below), whose sum is σ = 520304285592. Its totient is φ = 198211148928.

The previous prime is 328287221611. The next prime is 328287221651. The reversal of 328287221613 is 316122782823.

328287221613 is a `hidden beast` number, since 3 + 2 + 8 + 2 + 8 + 7 + 2 + 21 + 613 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2288474244 + 325998747369 = 47838^2 + 570963^2 .

It is not a de Polignac number, because 328287221613 - 2¹ = 328287221611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328287221611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26464306 + ... + 26476707.

It is an arithmetic number, because the mean of its divisors is an integer number (21679345233).

Almost surely, 2^328287221613 is an apocalyptic number.

It is an amenable number.

328287221613 is a deficient number, since it is larger than the sum of its proper divisors (192017063979).

328287221613 is a wasteful number, since it uses less digits than its factorization.

328287221613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52941085 (or 52941082 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The spelling of 328287221613 in words is "three hundred twenty-eight billion, two hundred eighty-seven million, two hundred twenty-one thousand, six hundred thirteen".