28856688 has 60 divisors (see below), whose sum is σ = 86724360. Its totient is φ = 8244096.

The previous prime is 28856683. The next prime is 28856689. The reversal of 28856688 is 88665882.

It is a self number, because there is not a number n which added to its sum of digits gives 28856688.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28856683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3783 + ... + 8486.

It is an arithmetic number, because the mean of its divisors is an integer number (1445406).

Almost surely, 2^28856688 is an apocalyptic number.

28856688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28856688 is an abundant number, since it is smaller than the sum of its proper divisors (57867672).

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

28856688 is a wasteful number, since it uses less digits than its factorization.

28856688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12294 (or 12281 counting only the distinct ones).

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

The square root of 28856688 is about 5371.8421421334. The cubic root of 28856688 is about 306.7247548019.

The spelling of 28856688 in words is "twenty-eight million, eight hundred fifty-six thousand, six hundred eighty-eight".