28333331 has 8 divisors (see below), whose sum is σ = 30943584. Its totient is φ = 25784640.

The previous prime is 28333307. The next prime is 28333367. The reversal of 28333331 is 13333382.

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

It is a cyclic number.

It is not a de Polignac number, because 28333331 - 2⁶ = 28333267 is a prime.

It is a super-2 number, since 2×28333331² = 1605555291111122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28333331.

It is not an unprimeable number, because it can be changed into a prime (28333301) 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 7 ways as a sum of consecutive naturals, for example, 14426 + ... + 16271.

It is an arithmetic number, because the mean of its divisors is an integer number (3867948).

Almost surely, 2^28333331 is an apocalyptic number.

28333331 is a deficient number, since it is larger than the sum of its proper divisors (2610253).

28333331 is a wasteful number, since it uses less digits than its factorization.

28333331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30781.

The product of its digits is 3888, while the sum is 26.

The square root of 28333331 is about 5322.9062550453. The cubic root of 28333331 is about 304.8591340903.

The spelling of 28333331 in words is "twenty-eight million, three hundred thirty-three thousand, three hundred thirty-one".