328611661 has 8 divisors (see below), whose sum is σ = 375928704. Its totient is φ = 281387760.

The previous prime is 328611623. The next prime is 328611667. The reversal of 328611661 is 166116823.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 328611661 - 2¹⁷ = 328480589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328611667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15550 + ... + 29983.

It is an arithmetic number, because the mean of its divisors is an integer number (46991088).

Almost surely, 2^328611661 is an apocalyptic number.

It is an amenable number.

328611661 is a deficient number, since it is larger than the sum of its proper divisors (47317043).

328611661 is a wasteful number, since it uses less digits than its factorization.

328611661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46571.

The product of its digits is 10368, while the sum is 34.

The square root of 328611661 is about 18127.6490753765. The cubic root of 328611661 is about 690.0718688705.

The spelling of 328611661 in words is "three hundred twenty-eight million, six hundred eleven thousand, six hundred sixty-one".