28009986 has 8 divisors (see below), whose sum is σ = 56019984. Its totient is φ = 9336660.

The previous prime is 28009981. The next prime is 28010053. The reversal of 28009986 is 68990082.

It is a sphenic number, since it is the product of 3 distinct primes.

28009986 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (28009981) by changing a digit.

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, 2334160 + ... + 2334171.

It is an arithmetic number, because the mean of its divisors is an integer number (7002498).

Almost surely, 2^28009986 is an apocalyptic number.

28009986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28009986 is a wasteful number, since it uses less digits than its factorization.

28009986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4668336.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 28009986 is about 5292.4461263200. The cubic root of 28009986 is about 303.6949921558.

The spelling of 28009986 in words is "twenty-eight million, nine thousand, nine hundred eighty-six".