6721868884 has 24 divisors (see below), whose sum is σ = 12791860200. Its totient is φ = 3077738496.

The previous prime is 6721868851. The next prime is 6721868893. The reversal of 6721868884 is 4888681276.

It can be written as a sum of positive squares in 4 ways, for example, as 2148322500 + 4573546384 = 46350^2 + 67628^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1333309 + ... + 1338340.

It is an arithmetic number, because the mean of its divisors is an integer number (532994175).

Almost surely, 2^6721868884 is an apocalyptic number.

It is an amenable number.

6721868884 is a deficient number, since it is larger than the sum of its proper divisors (6069991316).

6721868884 is a wasteful number, since it uses less digits than its factorization.

6721868884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671707 (or 2671705 counting only the distinct ones).

The product of its digits is 8257536, while the sum is 58.

The square root of 6721868884 is about 81987.0043604473. The cubic root of 6721868884 is about 1887.2525128723.

The spelling of 6721868884 in words is "six billion, seven hundred twenty-one million, eight hundred sixty-eight thousand, eight hundred eighty-four".