28933261 has 16 divisors (see below), whose sum is σ = 34398208. Its totient is φ = 23814000.

The previous prime is 28933259. The next prime is 28933273. The reversal of 28933261 is 16233982.

It is a happy number.

It is not a de Polignac number, because 28933261 - 2¹ = 28933259 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 (28933061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32326 + ... + 33208.

It is an arithmetic number, because the mean of its divisors is an integer number (2149888).

Almost surely, 2^28933261 is an apocalyptic number.

It is an amenable number.

28933261 is a deficient number, since it is larger than the sum of its proper divisors (5464947).

28933261 is a wasteful number, since it uses less digits than its factorization.

28933261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072.

The product of its digits is 15552, while the sum is 34.

The square root of 28933261 is about 5378.9646773334. The cubic root of 28933261 is about 306.9958195274.

The spelling of 28933261 in words is "twenty-eight million, nine hundred thirty-three thousand, two hundred sixty-one".