23281728 has 28 divisors (see below), whose sum is σ = 61600080. Its totient is φ = 7760512.

The previous prime is 23281723. The next prime is 23281733. The reversal of 23281728 is 82718232.

It is an interprime number because it is at equal distance from previous prime (23281723) and next prime (23281733).

It is not an unprimeable number, because it can be changed into a prime (23281723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60438 + ... + 60821.

Almost surely, 2^23281728 is an apocalyptic number.

It is an amenable number.

23281728 is an abundant number, since it is smaller than the sum of its proper divisors (38318352).

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

23281728 is a wasteful number, since it uses less digits than its factorization.

23281728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121274 (or 121264 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 23281728 is about 4825.1142991643. The cubic root of 23281728 is about 285.5431439834.

Subtracting from 23281728 its product of digits (10752), we obtain a square (23270976 = 4824²).

The spelling of 23281728 in words is "twenty-three million, two hundred eighty-one thousand, seven hundred twenty-eight".