6721260720 has 80 divisors (see below), whose sum is σ = 21229078752. Its totient is φ = 1758515200.

The previous prime is 6721260703. The next prime is 6721260731. The reversal of 6721260720 is 270621276.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251481 + ... + 276920.

Almost surely, 2^6721260720 is an apocalyptic number.

6721260720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6721260720 is an abundant number, since it is smaller than the sum of its proper divisors (14507818032).

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

6721260720 is a wasteful number, since it uses less digits than its factorization.

6721260720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528470 (or 528464 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 6721260720 is about 81983.2953716792. The cubic root of 6721260720 is about 1887.1955944927.

Adding to 6721260720 its reverse (270621276), we get a palindrome (6991881996).

The spelling of 6721260720 in words is "six billion, seven hundred twenty-one million, two hundred sixty thousand, seven hundred twenty".