28146871 has 4 divisors (see below), whose sum is σ = 29370672. Its totient is φ = 26923072.

The previous prime is 28146863. The next prime is 28146887. The reversal of 28146871 is 17864182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28146871 - 2³ = 28146863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28146871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28146821) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 611866 + ... + 611911.

It is an arithmetic number, because the mean of its divisors is an integer number (7342668).

Almost surely, 2^28146871 is an apocalyptic number.

28146871 is a deficient number, since it is larger than the sum of its proper divisors (1223801).

28146871 is a wasteful number, since it uses less digits than its factorization.

28146871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223800.

The product of its digits is 21504, while the sum is 37.

The square root of 28146871 is about 5305.3624758352. The cubic root of 28146871 is about 304.1889082962.

The spelling of 28146871 in words is "twenty-eight million, one hundred forty-six thousand, eight hundred seventy-one".