28724568 has 16 divisors (see below), whose sum is σ = 71811480. Its totient is φ = 9574848.

The previous prime is 28724503. The next prime is 28724581. The reversal of 28724568 is 86542782.

It is a happy number.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 598405 + ... + 598452.

Almost surely, 2^28724568 is an apocalyptic number.

It is an amenable number.

28724568 is an abundant number, since it is smaller than the sum of its proper divisors (43086912).

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

28724568 is a wasteful number, since it uses less digits than its factorization.

28724568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196866 (or 1196862 counting only the distinct ones).

The product of its digits is 215040, while the sum is 42.

The square root of 28724568 is about 5359.5305764591. The cubic root of 28724568 is about 306.2559266936.

It can be divided in two parts, 28724 and 568, that added together give a palindrome (29292).

The spelling of 28724568 in words is "twenty-eight million, seven hundred twenty-four thousand, five hundred sixty-eight".