33728556 has 12 divisors (see below), whose sum is σ = 78699992. Its totient is φ = 11242848.

The previous prime is 33728551. The next prime is 33728573. The reversal of 33728556 is 65582733.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×33728556² = 2275230979690272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33728551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1405345 + ... + 1405368.

Almost surely, 2^33728556 is an apocalyptic number.

It is an amenable number.

33728556 is an abundant number, since it is smaller than the sum of its proper divisors (44971436).

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

33728556 is a wasteful number, since it uses less digits than its factorization.

33728556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2810720 (or 2810718 counting only the distinct ones).

The product of its digits is 151200, while the sum is 39.

The square root of 33728556 is about 5807.6291203898. The cubic root of 33728556 is about 323.0967450074.

The spelling of 33728556 in words is "thirty-three million, seven hundred twenty-eight thousand, five hundred fifty-six".