28187946 has 16 divisors (see below), whose sum is σ = 62640000. Its totient is φ = 9395964.

The previous prime is 28187941. The next prime is 28187947. The reversal of 28187946 is 64978182.

It is not an unprimeable number, because it can be changed into a prime (28187941) 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 7 ways as a sum of consecutive naturals, for example, 260946 + ... + 261053.

It is an arithmetic number, because the mean of its divisors is an integer number (3915000).

Almost surely, 2^28187946 is an apocalyptic number.

28187946 is an abundant number, since it is smaller than the sum of its proper divisors (34452054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28187946 is a wasteful number, since it uses less digits than its factorization.

28187946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522010 (or 522004 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 28187946 is about 5309.2321478722. The cubic root of 28187946 is about 304.3368049786.

The spelling of 28187946 in words is "twenty-eight million, one hundred eighty-seven thousand, nine hundred forty-six".