28487187 has 16 divisors (see below), whose sum is σ = 42581280. Its totient is φ = 18821376.

The previous prime is 28487159. The next prime is 28487191. The reversal of 28487187 is 78178482.

It is not a de Polignac number, because 28487187 - 2⁷ = 28487059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28487197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1618 + ... + 7719.

It is an arithmetic number, because the mean of its divisors is an integer number (2661330).

Almost surely, 2^28487187 is an apocalyptic number.

28487187 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28487187 is a deficient number, since it is larger than the sum of its proper divisors (14094093).

28487187 is a wasteful number, since it uses less digits than its factorization.

28487187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9459 (or 9453 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 28487187 is about 5337.3389437059. The cubic root of 28487187 is about 305.4099548633.

The spelling of 28487187 in words is "twenty-eight million, four hundred eighty-seven thousand, one hundred eighty-seven".