33528728 has 8 divisors (see below), whose sum is σ = 62866380. Its totient is φ = 16764360.

The previous prime is 33528721. The next prime is 33528731. The reversal of 33528728 is 82782533.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×33528728² = 2248351202595968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33528691 and 33528700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33528721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2095538 + ... + 2095553.

Almost surely, 2^33528728 is an apocalyptic number.

It is an amenable number.

33528728 is a deficient number, since it is larger than the sum of its proper divisors (29337652).

33528728 is a wasteful number, since it uses less digits than its factorization.

33528728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4191097 (or 4191093 counting only the distinct ones).

The product of its digits is 80640, while the sum is 38.

The square root of 33528728 is about 5790.3996407847. The cubic root of 33528728 is about 322.4574083929.

The spelling of 33528728 in words is "thirty-three million, five hundred twenty-eight thousand, seven hundred twenty-eight".