28232865 has 24 divisors (see below), whose sum is σ = 49533120. Its totient is φ = 14874144.

The previous prime is 28232821. The next prime is 28232873. The reversal of 28232865 is 56823282.

It is not a de Polignac number, because 28232865 - 2¹⁵ = 28200097 is a prime.

It is a super-2 number, since 2×28232865² = 1594189332216450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45 + ... + 7514.

It is an arithmetic number, because the mean of its divisors is an integer number (2063880).

Almost surely, 2^28232865 is an apocalyptic number.

It is an amenable number.

28232865 is a deficient number, since it is larger than the sum of its proper divisors (21300255).

28232865 is a wasteful number, since it uses less digits than its factorization.

28232865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7653 (or 7650 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 28232865 is about 5313.4607366574. The cubic root of 28232865 is about 304.4983781774.

The spelling of 28232865 in words is "twenty-eight million, two hundred thirty-two thousand, eight hundred sixty-five".