28684641 has 8 divisors (see below), whose sum is σ = 39480064. Its totient is φ = 18506160.

The previous prime is 28684637. The next prime is 28684651. The reversal of 28684641 is 14648682.

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

It is not a de Polignac number, because 28684641 - 2² = 28684637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28684641.

It is not an unprimeable number, because it can be changed into a prime (28684651) 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, 154126 + ... + 154311.

It is an arithmetic number, because the mean of its divisors is an integer number (4935008).

Almost surely, 2^28684641 is an apocalyptic number.

It is an amenable number.

28684641 is a deficient number, since it is larger than the sum of its proper divisors (10795423).

28684641 is a wasteful number, since it uses less digits than its factorization.

28684641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308471.

The product of its digits is 73728, while the sum is 39.

The square root of 28684641 is about 5355.8044213731. The cubic root of 28684641 is about 306.1139628489.

The spelling of 28684641 in words is "twenty-eight million, six hundred eighty-four thousand, six hundred forty-one".