28915305 has 8 divisors (see below), whose sum is σ = 46264512. Its totient is φ = 15421488.

The previous prime is 28915261. The next prime is 28915309. The reversal of 28915305 is 50351982.

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

It is not a de Polignac number, because 28915305 - 2⁷ = 28915177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28915309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 963829 + ... + 963858.

It is an arithmetic number, because the mean of its divisors is an integer number (5783064).

Almost surely, 2^28915305 is an apocalyptic number.

It is an amenable number.

28915305 is a deficient number, since it is larger than the sum of its proper divisors (17349207).

28915305 is a wasteful number, since it uses less digits than its factorization.

28915305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927695.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 28915305 is about 5377.2953238594. The cubic root of 28915305 is about 306.9322991190.

The spelling of 28915305 in words is "twenty-eight million, nine hundred fifteen thousand, three hundred five".