28516187 has 12 divisors (see below), whose sum is σ = 34243776. Its totient is φ = 23652720.

The previous prime is 28516153. The next prime is 28516217. The reversal of 28516187 is 78161582.

It is not a de Polignac number, because 28516187 - 2¹² = 28512091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28516187.

It is not an unprimeable number, because it can be changed into a prime (28516087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7868 + ... + 10905.

It is an arithmetic number, because the mean of its divisors is an integer number (2853648).

Almost surely, 2^28516187 is an apocalyptic number.

28516187 is a deficient number, since it is larger than the sum of its proper divisors (5727589).

28516187 is a wasteful number, since it uses less digits than its factorization.

28516187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18818 (or 18811 counting only the distinct ones).

The product of its digits is 26880, while the sum is 38.

The square root of 28516187 is about 5340.0549622640. The cubic root of 28516187 is about 305.5135556499.

The spelling of 28516187 in words is "twenty-eight million, five hundred sixteen thousand, one hundred eighty-seven".