23728321 has 4 divisors (see below), whose sum is σ = 24977200. Its totient is φ = 22479444.

The previous prime is 23728297. The next prime is 23728343. The reversal of 23728321 is 12382732.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23728321 - 2¹³ = 23720129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23728321.

It is not an unprimeable number, because it can be changed into a prime (23728391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624411 + ... + 624448.

It is an arithmetic number, because the mean of its divisors is an integer number (6244300).

Almost surely, 2^23728321 is an apocalyptic number.

It is an amenable number.

23728321 is a deficient number, since it is larger than the sum of its proper divisors (1248879).

23728321 is a wasteful number, since it uses less digits than its factorization.

23728321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248878.

The product of its digits is 4032, while the sum is 28.

The square root of 23728321 is about 4871.1724461366. The cubic root of 23728321 is about 287.3573674350.

The spelling of 23728321 in words is "twenty-three million, seven hundred twenty-eight thousand, three hundred twenty-one".