33428188 has 12 divisors (see below), whose sum is σ = 61940592. Its totient is φ = 15730880.

The previous prime is 33428173. The next prime is 33428189. The reversal of 33428188 is 88182433.

It is a super-2 number, since 2×33428188² = 2234887505926688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33428189) 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, 245728 + ... + 245863.

It is an arithmetic number, because the mean of its divisors is an integer number (5161716).

Almost surely, 2^33428188 is an apocalyptic number.

It is an amenable number.

33428188 is a deficient number, since it is larger than the sum of its proper divisors (28512404).

33428188 is a wasteful number, since it uses less digits than its factorization.

33428188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491612 (or 491610 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 33428188 is about 5781.7115113087. The cubic root of 33428188 is about 322.1347763412.

The spelling of 33428188 in words is "thirty-three million, four hundred twenty-eight thousand, one hundred eighty-eight".