28688168 has 8 divisors (see below), whose sum is σ = 53790330. Its totient is φ = 14344080.

The previous prime is 28688167. The next prime is 28688173. The reversal of 28688168 is 86188682.

It can be written as a sum of positive squares in only one way, i.e., 28281124 + 407044 = 5318^2 + 638^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28688167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1793003 + ... + 1793018.

Almost surely, 2^28688168 is an apocalyptic number.

It is an amenable number.

28688168 is a deficient number, since it is larger than the sum of its proper divisors (25102162).

28688168 is a wasteful number, since it uses less digits than its factorization.

28688168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3586027 (or 3586023 counting only the distinct ones).

The product of its digits is 294912, while the sum is 47.

The square root of 28688168 is about 5356.1336801839. The cubic root of 28688168 is about 306.1265087000.

The spelling of 28688168 in words is "twenty-eight million, six hundred eighty-eight thousand, one hundred sixty-eight".