28933911 has 6 divisors (see below), whose sum is σ = 41793440. Its totient is φ = 19289268.

The previous prime is 28933867. The next prime is 28933939. The reversal of 28933911 is 11933982.

It is not a de Polignac number, because 28933911 - 2⁷ = 28933783 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 (28931911) 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 5 ways as a sum of consecutive naturals, for example, 1607431 + ... + 1607448.

Almost surely, 2^28933911 is an apocalyptic number.

28933911 is a deficient number, since it is larger than the sum of its proper divisors (12859529).

28933911 is a wasteful number, since it uses less digits than its factorization.

28933911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3214885 (or 3214882 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 28933911 is about 5379.0250975432. The cubic root of 28933911 is about 306.9981184477.

The spelling of 28933911 in words is "twenty-eight million, nine hundred thirty-three thousand, nine hundred eleven".