28533969 has 12 divisors (see below), whose sum is σ = 41581956. Its totient is φ = 18853632.

The previous prime is 28533959. The next prime is 28534001. The reversal of 28533969 is 96933582.

28533969 is a `hidden beast` number, since 28 + 533 + 96 + 9 = 666.

28533969 is nontrivially palindromic in base 12.

It can be written as a sum of positive squares in 2 ways, for example, as 6066369 + 22467600 = 2463^2 + 4740^2 .

It is not a de Polignac number, because 28533969 - 2⁵ = 28533937 is a prime.

It is a super-2 number, since 2×28533969² = 1628374773785922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28533929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13012 + ... + 15045.

It is an arithmetic number, because the mean of its divisors is an integer number (3465163).

Almost surely, 2^28533969 is an apocalyptic number.

It is an amenable number.

28533969 is a deficient number, since it is larger than the sum of its proper divisors (13047987).

28533969 is a wasteful number, since it uses less digits than its factorization.

28533969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28176 (or 28173 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 28533969 is about 5341.7196669238. The cubic root of 28533969 is about 305.5770460600.

The spelling of 28533969 in words is "twenty-eight million, five hundred thirty-three thousand, nine hundred sixty-nine".