6721318040 has 64 divisors (see below), whose sum is σ = 15318754560. Its totient is φ = 2653948800.

The previous prime is 6721318027. The next prime is 6721318057. The reversal of 6721318040 is 408131276.

It is a super-2 number, since 2×6721318040² = 90352232389658883200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6721317988 and 6721318006.

It is a congruent number.

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, 981107 + ... + 987933.

It is an arithmetic number, because the mean of its divisors is an integer number (239355540).

Almost surely, 2^6721318040 is an apocalyptic number.

It is an amenable number.

6721318040 is an abundant number, since it is smaller than the sum of its proper divisors (8597436520).

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

6721318040 is a wasteful number, since it uses less digits than its factorization.

6721318040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7152 (or 7148 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 6721318040 is about 81983.6449543444. The cubic root of 6721318040 is about 1887.2009592473.

The spelling of 6721318040 in words is "six billion, seven hundred twenty-one million, three hundred eighteen thousand, forty".