23575721 has 4 divisors (see below), whose sum is σ = 25389252. Its totient is φ = 21762192.

The previous prime is 23575711. The next prime is 23575777. The reversal of 23575721 is 12757532.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1297321 + 22278400 = 1139^2 + 4720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23575721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23575711) 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, 906746 + ... + 906771.

It is an arithmetic number, because the mean of its divisors is an integer number (6347313).

Almost surely, 2^23575721 is an apocalyptic number.

It is an amenable number.

23575721 is a deficient number, since it is larger than the sum of its proper divisors (1813531).

23575721 is a wasteful number, since it uses less digits than its factorization.

23575721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813530.

The product of its digits is 14700, while the sum is 32.

The square root of 23575721 is about 4855.4836010433. The cubic root of 23575721 is about 286.7400309494.

The spelling of 23575721 in words is "twenty-three million, five hundred seventy-five thousand, seven hundred twenty-one".