328781917 has 4 divisors (see below), whose sum is σ = 328939776. Its totient is φ = 328624060.

The previous prime is 328781897. The next prime is 328781923. The reversal of 328781917 is 719187823.

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.

It is a cyclic number.

It is not a de Polignac number, because 328781917 - 2²³ = 320393309 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 (328782917) 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, 75763 + ... + 79984.

It is an arithmetic number, because the mean of its divisors is an integer number (82234944).

Almost surely, 2^328781917 is an apocalyptic number.

It is an amenable number.

328781917 is a deficient number, since it is larger than the sum of its proper divisors (157859).

328781917 is a wasteful number, since it uses less digits than its factorization.

328781917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157858.

The product of its digits is 169344, while the sum is 46.

The square root of 328781917 is about 18132.3444981613. The cubic root of 328781917 is about 690.1910253149.

The spelling of 328781917 in words is "three hundred twenty-eight million, seven hundred eighty-one thousand, nine hundred seventeen".