28523665 has 16 divisors (see below), whose sum is σ = 34848000. Its totient is φ = 22410432.

The previous prime is 28523653. The next prime is 28523669. The reversal of 28523665 is 56632582.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28523665 is a prime.

Its product of digits (86400) is a multiple of the sum of its prime divisors (576).

It is not an unprimeable number, because it can be changed into a prime (28523669) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 108324 + ... + 108586.

It is an arithmetic number, because the mean of its divisors is an integer number (2178000).

Almost surely, 2^28523665 is an apocalyptic number.

It is an amenable number.

28523665 is a deficient number, since it is larger than the sum of its proper divisors (6324335).

28523665 is a wasteful number, since it uses less digits than its factorization.

28523665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576.

The product of its digits is 86400, while the sum is 37.

The square root of 28523665 is about 5340.7550964260. The cubic root of 28523665 is about 305.5402589710.

The spelling of 28523665 in words is "twenty-eight million, five hundred twenty-three thousand, six hundred sixty-five".