721864680 has 32 divisors (see below), whose sum is σ = 2165594400. Its totient is φ = 192497216.

The previous prime is 721864673. The next prime is 721864697. The reversal of 721864680 is 86468127.

721864680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 3007650 + ... + 3007889.

It is an arithmetic number, because the mean of its divisors is an integer number (67674825).

Almost surely, 2^721864680 is an apocalyptic number.

It is an amenable number.

721864680 is an abundant number, since it is smaller than the sum of its proper divisors (1443729720).

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

721864680 is a wasteful number, since it uses less digits than its factorization.

721864680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6015553 (or 6015549 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 721864680 is about 26867.5395226284. The cubic root of 721864680 is about 897.0540217450.

The spelling of 721864680 in words is "seven hundred twenty-one million, eight hundred sixty-four thousand, six hundred eighty".