28656888 has 64 divisors (see below), whose sum is σ = 78654240. Its totient is φ = 8646144.

The previous prime is 28656869. The next prime is 28656889. The reversal of 28656888 is 88865682.

It is a self number, because there is not a number n which added to its sum of digits gives 28656888.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28656889) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15670 + ... + 17402.

Almost surely, 2^28656888 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 28656888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39327120).

28656888 is an abundant number, since it is smaller than the sum of its proper divisors (49997352).

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

28656888 is a wasteful number, since it uses less digits than its factorization.

28656888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808 (or 1804 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 51.

The square root of 28656888 is about 5353.2128670547. The cubic root of 28656888 is about 306.0152070703.

The spelling of 28656888 in words is "twenty-eight million, six hundred fifty-six thousand, eight hundred eighty-eight".