328887691 has 16 divisors (see below), whose sum is σ = 372750336. Its totient is φ = 287560000.

The previous prime is 328887673. The next prime is 328887707. The reversal of 328887691 is 196788823.

It is a cyclic number.

It is not a de Polignac number, because 328887691 - 2⁹ = 328887179 is a prime.

It is a super-2 number, since 2×328887691² = 216334226582622962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328887991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26886 + ... + 37156.

It is an arithmetic number, because the mean of its divisors is an integer number (23296896).

Almost surely, 2^328887691 is an apocalyptic number.

328887691 is a deficient number, since it is larger than the sum of its proper divisors (43862645).

328887691 is a wasteful number, since it uses less digits than its factorization.

328887691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10394.

The product of its digits is 1161216, while the sum is 52.

The square root of 328887691 is about 18135.2609851637. The cubic root of 328887691 is about 690.2650322623.

The spelling of 328887691 in words is "three hundred twenty-eight million, eight hundred eighty-seven thousand, six hundred ninety-one".