28508265 has 24 divisors (see below), whose sum is σ = 52016640. Its totient is φ = 14403744.

The previous prime is 28508261. The next prime is 28508267. The reversal of 28508265 is 56280582.

It is not a de Polignac number, because 28508265 - 2² = 28508261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28508261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15817 + ... + 17526.

It is an arithmetic number, because the mean of its divisors is an integer number (2167360).

Almost surely, 2^28508265 is an apocalyptic number.

It is an amenable number.

28508265 is a deficient number, since it is larger than the sum of its proper divisors (23508375).

28508265 is a wasteful number, since it uses less digits than its factorization.

28508265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33373 (or 33370 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 28508265 is about 5339.3131580757. The cubic root of 28508265 is about 305.4852617486.

The spelling of 28508265 in words is "twenty-eight million, five hundred eight thousand, two hundred sixty-five".