28875668 has 18 divisors (see below), whose sum is σ = 53334666. Its totient is φ = 13677264.

The previous prime is 28875659. The next prime is 28875683. The reversal of 28875668 is 86657882.

It can be written as a sum of positive squares in only one way, i.e., 27899524 + 976144 = 5282^2 + 988^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 8555 + ... + 11442.

It is an arithmetic number, because the mean of its divisors is an integer number (2963037).

Almost surely, 2^28875668 is an apocalyptic number.

It is an amenable number.

28875668 is a deficient number, since it is larger than the sum of its proper divisors (24458998).

28875668 is a wasteful number, since it uses less digits than its factorization.

28875668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20039 (or 20018 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 50.

The square root of 28875668 is about 5373.6084710369. The cubic root of 28875668 is about 306.7919877423.

The spelling of 28875668 in words is "twenty-eight million, eight hundred seventy-five thousand, six hundred sixty-eight".