8721918838976 has 56 divisors (see below), whose sum is σ = 20115321354240. Its totient is φ = 3674609862912.

The previous prime is 8721918838859. The next prime is 8721918838979. The reversal of 8721918838976 is 6798388191278.

It is a tau number, because it is divible by the number of its divisors (56).

It is a junction number, because it is equal to n+sod(n) for n = 8721918838897 and 8721918838906.

It is not an unprimeable number, because it can be changed into a prime (8721918838979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164961440 + ... + 165014303.

It is an arithmetic number, because the mean of its divisors is an integer number (359202167040).

Almost surely, 2^{8721918838976} is an apocalyptic number.

It is an amenable number.

8721918838976 is an abundant number, since it is smaller than the sum of its proper divisors (11393402515264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8721918838976 is a wasteful number, since it uses less digits than its factorization.

8721918838976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329975821 (or 329975811 counting only the distinct ones).

The product of its digits is 585252864, while the sum is 77.

The spelling of 8721918838976 in words is "eight trillion, seven hundred twenty-one billion, nine hundred eighteen million, eight hundred thirty-eight thousand, nine hundred seventy-six".