28668672 has 108 divisors (see below), whose sum is σ = 86412144. Its totient is φ = 9123840.

The previous prime is 28668667. The next prime is 28668683. The reversal of 28668672 is 27686682.

It is a happy number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 52722 + ... + 53262.

Almost surely, 2^28668672 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 28668672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43206072).

28668672 is an abundant number, since it is smaller than the sum of its proper divisors (57743472).

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

28668672 is a wasteful number, since it uses less digits than its factorization.

28668672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586 (or 569 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 28668672 is about 5354.3134013616. The cubic root of 28668672 is about 306.0571468304.

The spelling of 28668672 in words is "twenty-eight million, six hundred sixty-eight thousand, six hundred seventy-two".