28332011 has 4 divisors (see below), whose sum is σ = 28538952. Its totient is φ = 28125072.

The previous prime is 28332001. The next prime is 28332061. The reversal of 28332011 is 11023382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28332011 - 2¹⁰ = 28330987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28332001) 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, 103265 + ... + 103538.

It is an arithmetic number, because the mean of its divisors is an integer number (7134738).

Almost surely, 2^28332011 is an apocalyptic number.

28332011 is a deficient number, since it is larger than the sum of its proper divisors (206941).

28332011 is a wasteful number, since it uses less digits than its factorization.

28332011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206940.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 28332011 is about 5322.7822611863. The cubic root of 28332011 is about 304.8543997334.

Adding to 28332011 its reverse (11023382), we get a palindrome (39355393).

The spelling of 28332011 in words is "twenty-eight million, three hundred thirty-two thousand, eleven".