28087684 has 12 divisors (see below), whose sum is σ = 49366044. Its totient is φ = 13983104.

The previous prime is 28087663. The next prime is 28087693. The reversal of 28087684 is 48678082.

It can be written as a sum of positive squares in 2 ways, for example, as 3802500 + 24285184 = 1950^2 + 4928^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28087684.

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 3 ways as a sum of consecutive naturals, for example, 14137 + ... + 16000.

It is an arithmetic number, because the mean of its divisors is an integer number (4113837).

Almost surely, 2^28087684 is an apocalyptic number.

It is an amenable number.

28087684 is a deficient number, since it is larger than the sum of its proper divisors (21278360).

28087684 is a wasteful number, since it uses less digits than its factorization.

28087684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30374 (or 30372 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 28087684 is about 5299.7815049302. The cubic root of 28087684 is about 303.9755433926.

The spelling of 28087684 in words is "twenty-eight million, eighty-seven thousand, six hundred eighty-four".