8128724993 has 4 divisors (see below), whose sum is σ = 8167249968. Its totient is φ = 8090200020.

The previous prime is 8128724959. The next prime is 8128725019. The reversal of 8128724993 is 3994278218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8128724993 - 2²⁴ = 8111947777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8128724293) 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, 19262171 + ... + 19262592.

It is an arithmetic number, because the mean of its divisors is an integer number (2041812492).

Almost surely, 2^8128724993 is an apocalyptic number.

It is an amenable number.

8128724993 is a deficient number, since it is larger than the sum of its proper divisors (38524975).

8128724993 is a wasteful number, since it uses less digits than its factorization.

8128724993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38524974.

The product of its digits is 1741824, while the sum is 53.

The square root of 8128724993 is about 90159.4420623819. The cubic root of 8128724993 is about 2010.6700564653.

The spelling of 8128724993 in words is "eight billion, one hundred twenty-eight million, seven hundred twenty-four thousand, nine hundred ninety-three".