383521728 has 56 divisors (see below), whose sum is σ = 1019208528. Its totient is φ = 127277056.

The previous prime is 383521709. The next prime is 383521741. The reversal of 383521728 is 827125383.

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 7 ways as a sum of consecutive naturals, for example, 40450 + ... + 49022.

Almost surely, 2^383521728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 383521728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (509604264).

383521728 is an abundant number, since it is smaller than the sum of its proper divisors (635686800).

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

383521728 is a wasteful number, since it uses less digits than its factorization.

383521728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8821 (or 8811 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 383521728 is about 19583.7107821781. The cubic root of 383521728 is about 726.5463486043.

The spelling of 383521728 in words is "three hundred eighty-three million, five hundred twenty-one thousand, seven hundred twenty-eight".