28709668 has 48 divisors (see below), whose sum is σ = 58593024. Its totient is φ = 12188160.

The previous prime is 28709663. The next prime is 28709671. The reversal of 28709668 is 86690782.

It is not an unprimeable number, because it can be changed into a prime (28709663) 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 15 ways as a sum of consecutive naturals, for example, 41203 + ... + 41893.

It is an arithmetic number, because the mean of its divisors is an integer number (1220688).

Almost surely, 2^28709668 is an apocalyptic number.

It is an amenable number.

28709668 is an abundant number, since it is smaller than the sum of its proper divisors (29883356).

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

28709668 is a wasteful number, since it uses less digits than its factorization.

28709668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 28709668 is about 5358.1403490390. The cubic root of 28709668 is about 306.2029638716.

The spelling of 28709668 in words is "twenty-eight million, seven hundred nine thousand, six hundred sixty-eight".