28671165 has 20 divisors (see below), whose sum is σ = 51396444. Its totient is φ = 15291072.

The previous prime is 28671143. The next prime is 28671191. The reversal of 28671165 is 56117682.

It can be written as a sum of positive squares in 2 ways, for example, as 4435236 + 24235929 = 2106^2 + 4923^2 .

It is not a de Polignac number, because 28671165 - 2⁶ = 28671101 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34992 + ... + 35801.

Almost surely, 2^28671165 is an apocalyptic number.

It is an amenable number.

28671165 is a deficient number, since it is larger than the sum of its proper divisors (22725279).

28671165 is an equidigital number, since it uses as much as digits as its factorization.

28671165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70810 (or 70801 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 28671165 is about 5354.5461992591. The cubic root of 28671165 is about 306.0660180512.

The spelling of 28671165 in words is "twenty-eight million, six hundred seventy-one thousand, one hundred sixty-five".