28687824 has 80 divisors (see below), whose sum is σ = 89845440. Its totient is φ = 8691840.

The previous prime is 28687817. The next prime is 28687843. The reversal of 28687824 is 42878682.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28687824.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1734 + ... + 7770.

It is an arithmetic number, because the mean of its divisors is an integer number (1123068).

Almost surely, 2^28687824 is an apocalyptic number.

28687824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28687824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44922720).

28687824 is an abundant number, since it is smaller than the sum of its proper divisors (61157616).

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

28687824 is a wasteful number, since it uses less digits than its factorization.

28687824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6065 (or 6053 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 28687824 is about 5356.1015673716. The cubic root of 28687824 is about 306.1252851068.

The spelling of 28687824 in words is "twenty-eight million, six hundred eighty-seven thousand, eight hundred twenty-four".