28265688 has 96 divisors (see below), whose sum is σ = 84661200. Its totient is φ = 8448000.

The previous prime is 28265681. The next prime is 28265693. The reversal of 28265688 is 88656282.

28265688 is a `hidden beast` number, since 2 + 82 + 6 + 568 + 8 = 666.

It is a super-2 number, since 2×28265688² = 1597898236226688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28265681) 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, 70288 + ... + 70688.

Almost surely, 2^28265688 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 28265688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42330600).

28265688 is an abundant number, since it is smaller than the sum of its proper divisors (56395512).

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

28265688 is a wasteful number, since it uses less digits than its factorization.

28265688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513 (or 506 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 28265688 is about 5316.5485044341. The cubic root of 28265688 is about 304.6163338484.

The spelling of 28265688 in words is "twenty-eight million, two hundred sixty-five thousand, six hundred eighty-eight".