28685872 has 40 divisors (see below), whose sum is σ = 57965040. Its totient is φ = 13735680.

The previous prime is 28685863. The next prime is 28685893. The reversal of 28685872 is 27858682.

It is a happy 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, 97758 + ... + 98050.

It is an arithmetic number, because the mean of its divisors is an integer number (1449126).

Almost surely, 2^28685872 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 28685872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28982520).

28685872 is an abundant number, since it is smaller than the sum of its proper divisors (29279168).

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

28685872 is a wasteful number, since it uses less digits than its factorization.

28685872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541 (or 535 counting only the distinct ones).

The product of its digits is 430080, while the sum is 46.

The square root of 28685872 is about 5355.9193421858. The cubic root of 28685872 is about 306.1183417417.

The spelling of 28685872 in words is "twenty-eight million, six hundred eighty-five thousand, eight hundred seventy-two".