28199933 has 4 divisors (see below), whose sum is σ = 29684160. Its totient is φ = 26715708.

The previous prime is 28199921. The next prime is 28199947. The reversal of 28199933 is 33999182.

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 28199933 - 2²⁴ = 11422717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28199833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742085 + ... + 742122.

It is an arithmetic number, because the mean of its divisors is an integer number (7421040).

Almost surely, 2^28199933 is an apocalyptic number.

It is an amenable number.

28199933 is a deficient number, since it is larger than the sum of its proper divisors (1484227).

28199933 is a wasteful number, since it uses less digits than its factorization.

28199933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484226.

The product of its digits is 104976, while the sum is 44.

The square root of 28199933 is about 5310.3609105220. The cubic root of 28199933 is about 304.3799388804.

The spelling of 28199933 in words is "twenty-eight million, one hundred ninety-nine thousand, nine hundred thirty-three".