28259688 has 64 divisors (see below), whose sum is σ = 76968000. Its totient is φ = 8612352.

The previous prime is 28259681. The next prime is 28259719. The reversal of 28259688 is 88695282.

It is not an unprimeable number, because it can be changed into a prime (28259681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12156 + ... + 14292.

It is an arithmetic number, because the mean of its divisors is an integer number (1202625).

Almost surely, 2^28259688 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 28259688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38484000).

28259688 is an abundant number, since it is smaller than the sum of its proper divisors (48708312).

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

28259688 is a wasteful number, since it uses less digits than its factorization.

28259688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194 (or 2190 counting only the distinct ones).

The product of its digits is 552960, while the sum is 48.

The square root of 28259688 is about 5315.9841986221. The cubic root of 28259688 is about 304.5947785344.

The spelling of 28259688 in words is "twenty-eight million, two hundred fifty-nine thousand, six hundred eighty-eight".