28684642 has 16 divisors (see below), whose sum is σ = 51762240. Its totient is φ = 11646288.

The previous prime is 28684637. The next prime is 28684651. The reversal of 28684642 is 24648682.

It is a junction number, because it is equal to n+sod(n) for n = 28684595 and 28684604.

It is an unprimeable number.

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, 53653 + ... + 54184.

It is an arithmetic number, because the mean of its divisors is an integer number (3235140).

Almost surely, 2^28684642 is an apocalyptic number.

28684642 is a deficient number, since it is larger than the sum of its proper divisors (23077598).

28684642 is a wasteful number, since it uses less digits than its factorization.

28684642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107865.

The product of its digits is 147456, while the sum is 40.

The square root of 28684642 is about 5355.8045147298. The cubic root of 28684642 is about 306.1139664062.

The spelling of 28684642 in words is "twenty-eight million, six hundred eighty-four thousand, six hundred forty-two".