28687185 has 24 divisors (see below), whose sum is σ = 50042304. Its totient is φ = 15202080.

The previous prime is 28687163. The next prime is 28687199. The reversal of 28687185 is 58178682.

It is not a de Polignac number, because 28687185 - 2¹² = 28683089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28687185.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5380 + ... + 9290.

It is an arithmetic number, because the mean of its divisors is an integer number (2085096).

Almost surely, 2^28687185 is an apocalyptic number.

It is an amenable number.

28687185 is a deficient number, since it is larger than the sum of its proper divisors (21355119).

28687185 is a wasteful number, since it uses less digits than its factorization.

28687185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4085 (or 4082 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 28687185 is about 5356.0419154447. The cubic root of 28687185 is about 306.1230121854.

The spelling of 28687185 in words is "twenty-eight million, six hundred eighty-seven thousand, one hundred eighty-five".