33388928 has 32 divisors (see below), whose sum is σ = 70023000. Its totient is φ = 15814656.

The previous prime is 33388907. The next prime is 33388933. The reversal of 33388928 is 82988333.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×33388928² = 2229641025978368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4433 + ... + 9296.

Almost surely, 2^33388928 is an apocalyptic number.

33388928 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

33388928 is an abundant number, since it is smaller than the sum of its proper divisors (36634072).

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

33388928 is a wasteful number, since it uses less digits than its factorization.

33388928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13762 (or 13750 counting only the distinct ones).

The product of its digits is 248832, while the sum is 44.

The square root of 33388928 is about 5778.3153254214. The cubic root of 33388928 is about 322.0086156922.

The spelling of 33388928 in words is "thirty-three million, three hundred eighty-eight thousand, nine hundred twenty-eight".