28285905 has 16 divisors (see below), whose sum is σ = 45549504. Its totient is φ = 14988480.

The previous prime is 28285867. The next prime is 28285921. The reversal of 28285905 is 50958282.

It is not a de Polignac number, because 28285905 - 2¹² = 28281809 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3651 + ... + 8360.

It is an arithmetic number, because the mean of its divisors is an integer number (2846844).

Almost surely, 2^28285905 is an apocalyptic number.

It is an amenable number.

28285905 is a deficient number, since it is larger than the sum of its proper divisors (17263599).

28285905 is a wasteful number, since it uses less digits than its factorization.

28285905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12176.

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 28285905 is about 5318.4494920982. The cubic root of 28285905 is about 304.6889420313.

The spelling of 28285905 in words is "twenty-eight million, two hundred eighty-five thousand, nine hundred five".