28660688 has 60 divisors (see below), whose sum is σ = 65308320. Its totient is φ = 12148416.

The previous prime is 28660679. The next prime is 28660717. The reversal of 28660688 is 88606682.

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 11 ways as a sum of consecutive naturals, for example, 108845 + ... + 109107.

It is an arithmetic number, because the mean of its divisors is an integer number (1088472).

Almost surely, 2^28660688 is an apocalyptic number.

28660688 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 28660688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32654160).

28660688 is an abundant number, since it is smaller than the sum of its proper divisors (36647632).

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

28660688 is a wasteful number, since it uses less digits than its factorization.

28660688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The square root of 28660688 is about 5353.5677823298. The cubic root of 28660688 is about 306.0287326887.

The spelling of 28660688 in words is "twenty-eight million, six hundred sixty thousand, six hundred eighty-eight".