28716688 has 120 divisors (see below), whose sum is σ = 75731264. Its totient is φ = 10264320.

The previous prime is 28716683. The next prime is 28716691. The reversal of 28716688 is 88661782.

It is not an unprimeable number, because it can be changed into a prime (28716683) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 176095 + ... + 176257.

Almost surely, 2^28716688 is an apocalyptic number.

28716688 is a gapful number since it is divisible by the number (28) 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 28716688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37865632).

28716688 is an abundant number, since it is smaller than the sum of its proper divisors (47014576).

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

28716688 is a wasteful number, since it uses less digits than its factorization.

28716688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 196 counting only the distinct ones).

The product of its digits is 258048, while the sum is 46.

The square root of 28716688 is about 5358.7953870250. The cubic root of 28716688 is about 306.2279191077.

It can be divided in two parts, 2871 and 6688, that added together give a palindrome (9559).

The spelling of 28716688 in words is "twenty-eight million, seven hundred sixteen thousand, six hundred eighty-eight".