721724243788 has 12 divisors (see below), whose sum is σ = 1263032342712. Its totient is φ = 360857860160.

The previous prime is 721724243771. The next prime is 721724243809. The reversal of 721724243788 is 887342427127.

It is a happy number.

721724243788 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 3 ways as a sum of consecutive naturals, for example, 667918 + ... + 1374613.

It is an arithmetic number, because the mean of its divisors is an integer number (105252695226).

Almost surely, 2^721724243788 is an apocalyptic number.

It is an amenable number.

721724243788 is a deficient number, since it is larger than the sum of its proper divisors (541308098924).

721724243788 is a wasteful number, since it uses less digits than its factorization.

721724243788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130872 (or 2130870 counting only the distinct ones).

The product of its digits is 8429568, while the sum is 55.

The spelling of 721724243788 in words is "seven hundred twenty-one billion, seven hundred twenty-four million, two hundred forty-three thousand, seven hundred eighty-eight".