23986728649 has 4 divisors (see below), whose sum is σ = 25831861636. Its totient is φ = 22141595664.

The previous prime is 23986728643. The next prime is 23986728659. The reversal of 23986728649 is 94682768932.

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 2070887049 + 21915841600 = 45507^2 + 148040^2 .

It is a cyclic number.

It is not a de Polignac number, because 23986728649 - 2³ = 23986728641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23986728641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 922566474 + ... + 922566499.

It is an arithmetic number, because the mean of its divisors is an integer number (6457965409).

Almost surely, 2^23986728649 is an apocalyptic number.

It is an amenable number.

23986728649 is a deficient number, since it is larger than the sum of its proper divisors (1845132987).

23986728649 is a wasteful number, since it uses less digits than its factorization.

23986728649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845132986.

The product of its digits is 62705664, while the sum is 64.

The spelling of 23986728649 in words is "twenty-three billion, nine hundred eighty-six million, seven hundred twenty-eight thousand, six hundred forty-nine".