23768721 has 10 divisors (see below), whose sum is σ = 35506482. Its totient is φ = 15845760.

The previous prime is 23768663. The next prime is 23768743. The reversal of 23768721 is 12786732.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 3111696 = 4545^2 + 1764^2 .

It is not a de Polignac number, because 23768721 - 2¹⁵ = 23735953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23761721) 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 9 ways as a sum of consecutive naturals, for example, 146640 + ... + 146801.

Almost surely, 2^23768721 is an apocalyptic number.

It is an amenable number.

23768721 is a deficient number, since it is larger than the sum of its proper divisors (11737761).

23768721 is an equidigital number, since it uses as much as digits as its factorization.

23768721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293453 (or 293444 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 23768721 is about 4875.3175281206. The cubic root of 23768721 is about 287.5203604988.

The spelling of 23768721 in words is "twenty-three million, seven hundred sixty-eight thousand, seven hundred twenty-one".