28658688 has 88 divisors (see below), whose sum is σ = 80569920. Its totient is φ = 9031680.

The previous prime is 28658687. The next prime is 28658689. The reversal of 28658688 is 88685682.

It is an interprime number because it is at equal distance from previous prime (28658687) and next prime (28658689).

It is a self number, because there is not a number n which added to its sum of digits gives 28658688.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28658681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58123 + ... + 58613.

Almost surely, 2^28658688 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 28658688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40284960).

28658688 is an abundant number, since it is smaller than the sum of its proper divisors (51911232).

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

28658688 is a wasteful number, since it uses less digits than its factorization.

28658688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533 (or 515 counting only the distinct ones).

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

The square root of 28658688 is about 5353.3809877497. The cubic root of 28658688 is about 306.0216140912.

The spelling of 28658688 in words is "twenty-eight million, six hundred fifty-eight thousand, six hundred eighty-eight".