28323688 has 8 divisors (see below), whose sum is σ = 53106930. Its totient is φ = 14161840.

The previous prime is 28323671. The next prime is 28323689. The reversal of 28323688 is 88632382.

It can be written as a sum of positive squares in only one way, i.e., 28323684 + 4 = 5322^2 + 2^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 28323688.

It is not an unprimeable number, because it can be changed into a prime (28323689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1770223 + ... + 1770238.

Almost surely, 2^28323688 is an apocalyptic number.

It is an amenable number.

28323688 is a deficient number, since it is larger than the sum of its proper divisors (24783242).

28323688 is a wasteful number, since it uses less digits than its factorization.

28323688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3540467 (or 3540463 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 28323688 is about 5322.0003757986. Note that the first 3 decimals coincide. The cubic root of 28323688 is about 304.8245447910.

The spelling of 28323688 in words is "twenty-eight million, three hundred twenty-three thousand, six hundred eighty-eight".