328578491 has 4 divisors (see below), whose sum is σ = 332537352. Its totient is φ = 324619632.

The previous prime is 328578461. The next prime is 328578521. The reversal of 328578491 is 194875823.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194875823 = 2251 ⋅86573.

It is an interprime number because it is at equal distance from previous prime (328578461) and next prime (328578521).

It is a cyclic number.

It is not a de Polignac number, because 328578491 - 2⁶ = 328578427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328578451) 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, 1979306 + ... + 1979471.

It is an arithmetic number, because the mean of its divisors is an integer number (83134338).

Almost surely, 2^328578491 is an apocalyptic number.

328578491 is a deficient number, since it is larger than the sum of its proper divisors (3958861).

328578491 is an equidigital number, since it uses as much as digits as its factorization.

328578491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3958860.

The product of its digits is 483840, while the sum is 47.

The square root of 328578491 is about 18126.7341515233. The cubic root of 328578491 is about 690.0486495139.

The spelling of 328578491 in words is "three hundred twenty-eight million, five hundred seventy-eight thousand, four hundred ninety-one".