328781916 has 84 divisors (see below), whose sum is σ = 870010512. Its totient is φ = 108661824.

The previous prime is 328781897. The next prime is 328781923. The reversal of 328781916 is 619187823.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 399081 + ... + 399903.

It is an arithmetic number, because the mean of its divisors is an integer number (10357268).

Almost surely, 2^328781916 is an apocalyptic number.

328781916 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 328781916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (435005256).

328781916 is an abundant number, since it is smaller than the sum of its proper divisors (541228596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

328781916 is a wasteful number, since it uses less digits than its factorization.

328781916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982 (or 965 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 328781916 is about 18132.3444705863. The cubic root of 328781916 is about 690.1910246152.

The spelling of 328781916 in words is "three hundred twenty-eight million, seven hundred eighty-one thousand, nine hundred sixteen".