8721955887 has 16 divisors (see below), whose sum is σ = 11753978880. Its totient is φ = 5752334592.

The previous prime is 8721955883. The next prime is 8721955889. The reversal of 8721955887 is 7885591278.

It is not a de Polignac number, because 8721955887 - 2² = 8721955883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8721955887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721955883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 973008 + ... + 981930.

It is an arithmetic number, because the mean of its divisors is an integer number (734623680).

Almost surely, 2^8721955887 is an apocalyptic number.

8721955887 is a deficient number, since it is larger than the sum of its proper divisors (3032022993).

8721955887 is a wasteful number, since it uses less digits than its factorization.

8721955887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12382.

The product of its digits is 11289600, while the sum is 60.

The square root of 8721955887 is about 93391.4122765043. The cubic root of 8721955887 is about 2058.4388120340.

The spelling of 8721955887 in words is "eight billion, seven hundred twenty-one million, nine hundred fifty-five thousand, eight hundred eighty-seven".