33728893 has 4 divisors (see below), whose sum is σ = 36795168. Its totient is φ = 30662620.

The previous prime is 33728869. The next prime is 33728897. The reversal of 33728893 is 39882733.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 33728893 - 2¹⁷ = 33597821 is a prime.

It is a super-2 number, since 2×33728893² = 2275276446010898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33728897) 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, 1533121 + ... + 1533142.

It is an arithmetic number, because the mean of its divisors is an integer number (9198792).

Almost surely, 2^33728893 is an apocalyptic number.

It is an amenable number.

33728893 is a deficient number, since it is larger than the sum of its proper divisors (3066275).

33728893 is a wasteful number, since it uses less digits than its factorization.

33728893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066274.

The product of its digits is 217728, while the sum is 43.

The square root of 33728893 is about 5807.6581338781. The cubic root of 33728893 is about 323.0978210812.

The spelling of 33728893 in words is "thirty-three million, seven hundred twenty-eight thousand, eight hundred ninety-three".