28236688 has 20 divisors (see below), whose sum is σ = 54840240. Its totient is φ = 14084384.

The previous prime is 28236673. The next prime is 28236701. The reversal of 28236688 is 88663282.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5583 + ... + 9361.

It is an arithmetic number, because the mean of its divisors is an integer number (2742012).

Almost surely, 2^28236688 is an apocalyptic number.

It is an amenable number.

28236688 is a deficient number, since it is larger than the sum of its proper divisors (26603552).

28236688 is a wasteful number, since it uses less digits than its factorization.

28236688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254 (or 4248 counting only the distinct ones).

The product of its digits is 221184, while the sum is 43.

The square root of 28236688 is about 5313.8204711864. The cubic root of 28236688 is about 304.5121215548.

The spelling of 28236688 in words is "twenty-eight million, two hundred thirty-six thousand, six hundred eighty-eight".