28871205 has 24 divisors (see below), whose sum is σ = 50778336. Its totient is φ = 13997280.

The previous prime is 28871197. The next prime is 28871231. The reversal of 28871205 is 50217882.

It is not a de Polignac number, because 28871205 - 2³ = 28871197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6139 + ... + 9768.

It is an arithmetic number, because the mean of its divisors is an integer number (2115764).

Almost surely, 2^28871205 is an apocalyptic number.

It is an amenable number.

28871205 is a deficient number, since it is larger than the sum of its proper divisors (21907131).

28871205 is a wasteful number, since it uses less digits than its factorization.

28871205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15937 (or 15926 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 28871205 is about 5373.1931846901. The cubic root of 28871205 is about 306.7761810870.

The spelling of 28871205 in words is "twenty-eight million, eight hundred seventy-one thousand, two hundred five".