33412728 has 16 divisors (see below), whose sum is σ = 83531880. Its totient is φ = 11137568.

The previous prime is 33412693. The next prime is 33412733. The reversal of 33412728 is 82721433.

It is a super-3 number, since 3×33412728³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 33412695 and 33412704.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 696075 + ... + 696122.

Almost surely, 2^33412728 is an apocalyptic number.

It is an amenable number.

33412728 is an abundant number, since it is smaller than the sum of its proper divisors (50119152).

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

33412728 is a wasteful number, since it uses less digits than its factorization.

33412728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392206 (or 1392202 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 33412728 is about 5780.3743823389. The cubic root of 33412728 is about 322.0851079636.

The spelling of 33412728 in words is "thirty-three million, four hundred twelve thousand, seven hundred twenty-eight".