28909293 has 16 divisors (see below), whose sum is σ = 44174976. Its totient is φ = 16473600.

The previous prime is 28909273. The next prime is 28909297. The reversal of 28909293 is 39290982.

It is not a de Polignac number, because 28909293 - 2¹³ = 28901101 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28909297) 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, 6705 + ... + 10137.

It is an arithmetic number, because the mean of its divisors is an integer number (2760936).

Almost surely, 2^28909293 is an apocalyptic number.

It is an amenable number.

28909293 is a deficient number, since it is larger than the sum of its proper divisors (15265683).

28909293 is a wasteful number, since it uses less digits than its factorization.

28909293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3844.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 28909293 is about 5376.7362777060. The cubic root of 28909293 is about 306.9110254384.

The spelling of 28909293 in words is "twenty-eight million, nine hundred nine thousand, two hundred ninety-three".