23990375729 has 4 divisors (see below), whose sum is σ = 24112154484. Its totient is φ = 23868596976.

The previous prime is 23990375723. The next prime is 23990375779. The reversal of 23990375729 is 92757309932.

It is a happy number.

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 21294689329 + 2695686400 = 145927^2 + 51920^2 .

It is a cyclic number.

It is not a de Polignac number, because 23990375729 - 2⁸ = 23990375473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23990375723) 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, 60889082 + ... + 60889475.

It is an arithmetic number, because the mean of its divisors is an integer number (6028038621).

Almost surely, 2^23990375729 is an apocalyptic number.

It is an amenable number.

23990375729 is a deficient number, since it is larger than the sum of its proper divisors (121778755).

23990375729 is a wasteful number, since it uses less digits than its factorization.

23990375729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121778754.

The product of its (nonzero) digits is 6429780, while the sum is 56.

The spelling of 23990375729 in words is "twenty-three billion, nine hundred ninety million, three hundred seventy-five thousand, seven hundred twenty-nine".