23161728 has 32 divisors (see below), whose sum is σ = 61524360. Its totient is φ = 7720448.

The previous prime is 23161727. The next prime is 23161751. The reversal of 23161728 is 82716132.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 23161695 and 23161704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23161727) 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, 29775 + ... + 30542.

Almost surely, 2^23161728 is an apocalyptic number.

It is an amenable number.

23161728 is an abundant number, since it is smaller than the sum of its proper divisors (38362632).

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

23161728 is an equidigital number, since it uses as much as digits as its factorization.

23161728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60334 (or 60322 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 23161728 is about 4812.6632959309. The cubic root of 23161728 is about 285.0517111462.

The spelling of 23161728 in words is "twenty-three million, one hundred sixty-one thousand, seven hundred twenty-eight".