28166825 has 12 divisors (see below), whose sum is σ = 34997760. Its totient is φ = 22487760.

The previous prime is 28166819. The next prime is 28166833. The reversal of 28166825 is 52866182.

It is not a de Polignac number, because 28166825 - 2²⁰ = 27118249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17192 + ... + 18758.

It is an arithmetic number, because the mean of its divisors is an integer number (2916480).

Almost surely, 2^28166825 is an apocalyptic number.

28166825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28166825 is a deficient number, since it is larger than the sum of its proper divisors (6830935).

28166825 is a wasteful number, since it uses less digits than its factorization.

28166825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2296 (or 2291 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 28166825 is about 5307.2426927737. The cubic root of 28166825 is about 304.2607736165.

The spelling of 28166825 in words is "twenty-eight million, one hundred sixty-six thousand, eight hundred twenty-five".