28256688 has 50 divisors (see below), whose sum is σ = 81786804. Its totient is φ = 9418464.

The previous prime is 28256687. The next prime is 28256713. The reversal of 28256688 is 88665282.

28256688 is a `hidden beast` number, since 2 + 8 + 2 + 566 + 88 = 666.

It is a super-3 number, since 3×28256688³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28256687) 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 9 ways as a sum of consecutive naturals, for example, 9606 + ... + 12197.

Almost surely, 2^28256688 is an apocalyptic number.

It is an amenable number.

28256688 is an abundant number, since it is smaller than the sum of its proper divisors (53530116).

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

28256688 is a wasteful number, since it uses less digits than its factorization.

28256688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21823 (or 21808 counting only the distinct ones).

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

The square root of 28256688 is about 5315.7020232515. The cubic root of 28256688 is about 304.5839997332.

The spelling of 28256688 in words is "twenty-eight million, two hundred fifty-six thousand, six hundred eighty-eight".