28665825 has 24 divisors (see below), whose sum is σ = 50184288. Its totient is φ = 14388480.

The previous prime is 28665823. The next prime is 28665829. The reversal of 28665825 is 52856682.

It is not a de Polignac number, because 28665825 - 2¹ = 28665823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28665823) 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, 9967 + ... + 12516.

It is an arithmetic number, because the mean of its divisors is an integer number (2091012).

Almost surely, 2^28665825 is an apocalyptic number.

28665825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28665825 is a deficient number, since it is larger than the sum of its proper divisors (21518463).

28665825 is a wasteful number, since it uses less digits than its factorization.

28665825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22513 (or 22508 counting only the distinct ones).

The product of its digits is 230400, while the sum is 42.

The square root of 28665825 is about 5354.0475343426. The cubic root of 28665825 is about 306.0470152887.

The spelling of 28665825 in words is "twenty-eight million, six hundred sixty-five thousand, eight hundred twenty-five".