328689861 has 4 divisors (see below), whose sum is σ = 438253152. Its totient is φ = 219126572.

The previous prime is 328689859. The next prime is 328689863. The reversal of 328689861 is 168986823.

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: 168986823 = 3 ⋅56328941.

It is an interprime number because it is at equal distance from previous prime (328689859) and next prime (328689863).

It is a cyclic number.

It is not a de Polignac number, because 328689861 - 2¹ = 328689859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328689863) 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, 54781641 + ... + 54781646.

It is an arithmetic number, because the mean of its divisors is an integer number (109563288).

Almost surely, 2^328689861 is an apocalyptic number.

It is an amenable number.

328689861 is a deficient number, since it is larger than the sum of its proper divisors (109563291).

328689861 is a wasteful number, since it uses less digits than its factorization.

328689861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109563290.

The product of its digits is 995328, while the sum is 51.

The square root of 328689861 is about 18129.8058732023. The cubic root of 328689861 is about 690.1266035280.

The spelling of 328689861 in words is "three hundred twenty-eight million, six hundred eighty-nine thousand, eight hundred sixty-one".