28686944 has 48 divisors (see below), whose sum is σ = 66361680. Its totient is φ = 12034560.

The previous prime is 28686919. The next prime is 28686961. The reversal of 28686944 is 44968682.

It is a congruent number.

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, 1442 + ... + 7710.

It is an arithmetic number, because the mean of its divisors is an integer number (1382535).

Almost surely, 2^28686944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28686944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33180840).

28686944 is an abundant number, since it is smaller than the sum of its proper divisors (37674736).

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

28686944 is a wasteful number, since it uses less digits than its factorization.

28686944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6303 (or 6295 counting only the distinct ones).

The product of its digits is 663552, while the sum is 47.

The square root of 28686944 is about 5356.0194174405. The cubic root of 28686944 is about 306.1221549402.

The spelling of 28686944 in words is "twenty-eight million, six hundred eighty-six thousand, nine hundred forty-four".