28166817 has 32 divisors (see below), whose sum is σ = 45260800. Its totient is φ = 15558480.

The previous prime is 28166813. The next prime is 28166819. The reversal of 28166817 is 71866182.

It is not a de Polignac number, because 28166817 - 2² = 28166813 is a prime.

It is a super-2 number, since 2×28166817² = 1586739159822978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28166813) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 31458 + ... + 32340.

It is an arithmetic number, because the mean of its divisors is an integer number (1414400).

Almost surely, 2^28166817 is an apocalyptic number.

It is an amenable number.

28166817 is a deficient number, since it is larger than the sum of its proper divisors (17093983).

28166817 is an equidigital number, since it uses as much as digits as its factorization.

28166817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938 (or 924 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 28166817 is about 5307.2419390866. The cubic root of 28166817 is about 304.2607448110.

The spelling of 28166817 in words is "twenty-eight million, one hundred sixty-six thousand, eight hundred seventeen".