8729671861 has 4 divisors (see below), whose sum is σ = 8756045824. Its totient is φ = 8703297900.

The previous prime is 8729671807. The next prime is 8729671871. The reversal of 8729671861 is 1681769278.

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 8729671861 - 2³¹ = 6582188213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8729671871) 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 3 ways as a sum of consecutive naturals, for example, 13186485 + ... + 13187146.

It is an arithmetic number, because the mean of its divisors is an integer number (2189011456).

Almost surely, 2^8729671861 is an apocalyptic number.

It is an amenable number.

8729671861 is a deficient number, since it is larger than the sum of its proper divisors (26373963).

8729671861 is a wasteful number, since it uses less digits than its factorization.

8729671861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26373962.

The product of its digits is 2032128, while the sum is 55.

The square root of 8729671861 is about 93432.7130131626. The cubic root of 8729671861 is about 2059.0456399524.

The spelling of 8729671861 in words is "eight billion, seven hundred twenty-nine million, six hundred seventy-one thousand, eight hundred sixty-one".