328699728 has 160 divisors (see below), whose sum is σ = 1093779200. Its totient is φ = 92565504.

The previous prime is 328699703. The next prime is 328699733. The reversal of 328699728 is 827996823.

It is a happy number.

It is a super-2 number, since 2×328699728² = 216087022374547968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220008 + ... + 221496.

It is an arithmetic number, because the mean of its divisors is an integer number (6836120).

Almost surely, 2^328699728 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 328699728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (546889600).

328699728 is an abundant number, since it is smaller than the sum of its proper divisors (765079472).

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

328699728 is a wasteful number, since it uses less digits than its factorization.

328699728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586 (or 1574 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 328699728 is about 18130.0779921102. The cubic root of 328699728 is about 690.1335091371.

The spelling of 328699728 in words is "three hundred twenty-eight million, six hundred ninety-nine thousand, seven hundred twenty-eight".