28668924 has 48 divisors (see below), whose sum is σ = 76733440. Its totient is φ = 9246960.

The previous prime is 28668859. The next prime is 28668931. The reversal of 28668924 is 42986682.

It is a self number, because there is not a number n which added to its sum of digits gives 28668924.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 934 + ... + 7629.

Almost surely, 2^28668924 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 28668924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38366720).

28668924 is an abundant number, since it is smaller than the sum of its proper divisors (48064516).

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

28668924 is a wasteful number, since it uses less digits than its factorization.

28668924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8607 (or 8599 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 28668924 is about 5354.3369337389. The cubic root of 28668924 is about 306.0580435837.

It can be divided in two parts, 28668 and 924, that added together give a palindrome (29592).

The spelling of 28668924 in words is "twenty-eight million, six hundred sixty-eight thousand, nine hundred twenty-four".