328622681 has 4 divisors (see below), whose sum is σ = 328660992. Its totient is φ = 328584372.

The previous prime is 328622663. The next prime is 328622717. The reversal of 328622681 is 186226823.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 328622681 - 2⁶ = 328622617 is a prime.

It is a super-2 number, since 2×328622681² = 215985732935255522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (328622611) 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, 296 + ... + 25638.

It is an arithmetic number, because the mean of its divisors is an integer number (82165248).

Almost surely, 2^328622681 is an apocalyptic number.

It is an amenable number.

328622681 is a deficient number, since it is larger than the sum of its proper divisors (38311).

328622681 is a wasteful number, since it uses less digits than its factorization.

328622681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38310.

The product of its digits is 55296, while the sum is 38.

The square root of 328622681 is about 18127.9530284034. The cubic root of 328622681 is about 690.0795826433.

The spelling of 328622681 in words is "three hundred twenty-eight million, six hundred twenty-two thousand, six hundred eighty-one".