33728218 has 8 divisors (see below), whose sum is σ = 52336980. Its totient is φ = 16282560.

The previous prime is 33728213. The next prime is 33728231. The reversal of 33728218 is 81282733.

It can be written as a sum of positive squares in 2 ways, for example, as 33327529 + 400689 = 5773^2 + 633^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×33728218² = 2275185378911048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33728213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290703 + ... + 290818.

Almost surely, 2^33728218 is an apocalyptic number.

33728218 is a deficient number, since it is larger than the sum of its proper divisors (18608762).

33728218 is a wasteful number, since it uses less digits than its factorization.

33728218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581552.

The product of its digits is 16128, while the sum is 34.

The square root of 33728218 is about 5807.6000206626. The cubic root of 33728218 is about 323.0956657334.

The spelling of 33728218 in words is "thirty-three million, seven hundred twenty-eight thousand, two hundred eighteen".