28688712 has 32 divisors (see below), whose sum is σ = 77239680. Its totient is φ = 8827200.

The previous prime is 28688711. The next prime is 28688717. The reversal of 28688712 is 21788682.

It is not an unprimeable number, because it can be changed into a prime (28688711) 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 7 ways as a sum of consecutive naturals, for example, 45664 + ... + 46287.

It is an arithmetic number, because the mean of its divisors is an integer number (2413740).

Almost surely, 2^28688712 is an apocalyptic number.

It is an amenable number.

28688712 is an abundant number, since it is smaller than the sum of its proper divisors (48550968).

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

28688712 is a wasteful number, since it uses less digits than its factorization.

28688712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91973 (or 91969 counting only the distinct ones).

The product of its digits is 86016, while the sum is 42.

The square root of 28688712 is about 5356.1844628429. The cubic root of 28688712 is about 306.1284436646.

The spelling of 28688712 in words is "twenty-eight million, six hundred eighty-eight thousand, seven hundred twelve".