28915293 has 32 divisors (see below), whose sum is σ = 43610112. Its totient is φ = 16891200.

The previous prime is 28915261. The next prime is 28915309. The reversal of 28915293 is 39251982.

It is not a de Polignac number, because 28915293 - 2⁵ = 28915261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28915213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159663 + ... + 159843.

It is an arithmetic number, because the mean of its divisors is an integer number (1362816).

Almost surely, 2^28915293 is an apocalyptic number.

It is an amenable number.

28915293 is a deficient number, since it is larger than the sum of its proper divisors (14694819).

28915293 is a wasteful number, since it uses less digits than its factorization.

28915293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345.

The product of its digits is 38880, while the sum is 39.

The square root of 28915293 is about 5377.2942080567. The cubic root of 28915293 is about 306.9322566595.

The spelling of 28915293 in words is "twenty-eight million, nine hundred fifteen thousand, two hundred ninety-three".