721444373008 has 20 divisors (see below), whose sum is σ = 1398318377020. Its totient is φ = 360588017664.

The previous prime is 721444372991. The next prime is 721444373009. The reversal of 721444373008 is 800373444127.

721444373008 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 198726940944 + 522717432064 = 445788^2 + 722992^2 .

It is not an unprimeable number, because it can be changed into a prime (721444373009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8341185 + ... + 8427232.

It is an arithmetic number, because the mean of its divisors is an integer number (69915918851).

Almost surely, 2^721444373008 is an apocalyptic number.

It is an amenable number.

721444373008 is a deficient number, since it is larger than the sum of its proper divisors (676874004012).

721444373008 is a wasteful number, since it uses less digits than its factorization.

721444373008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16771114 (or 16771108 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 43.

The spelling of 721444373008 in words is "seven hundred twenty-one billion, four hundred forty-four million, three hundred seventy-three thousand, eight".