28330728 has 16 divisors (see below), whose sum is σ = 70826880. Its totient is φ = 9443568.

The previous prime is 28330697. The next prime is 28330739. The reversal of 28330728 is 82703382.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590200 + ... + 590247.

It is an arithmetic number, because the mean of its divisors is an integer number (4426680).

Almost surely, 2^28330728 is an apocalyptic number.

It is an amenable number.

28330728 is an abundant number, since it is smaller than the sum of its proper divisors (42496152).

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

28330728 is a wasteful number, since it uses less digits than its factorization.

28330728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180456 (or 1180452 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 28330728 is about 5322.6617401447. The cubic root of 28330728 is about 304.8497979410.

The spelling of 28330728 in words is "twenty-eight million, three hundred thirty thousand, seven hundred twenty-eight".