721674474376440 has 256 divisors, whose sum is σ = 2386448330112000. Its totient is φ = 173463553880064.

The previous prime is 721674474376439. The next prime is 721674474376507. The reversal of 721674474376440 is 44673474476127.

It is a happy number.

721674474376440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 240466236 + ... + 243448884.

It is an arithmetic number, because the mean of its divisors is an integer number (9322063789500).

Almost surely, 2^{721674474376440} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721674474376440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1193224165056000).

721674474376440 is an abundant number, since it is smaller than the sum of its proper divisors (1664773855735560).

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

721674474376440 is a wasteful number, since it uses less digits than its factorization.

721674474376440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2986326 (or 2986322 counting only the distinct ones).

The product of its (nonzero) digits is 531062784, while the sum is 66.

The spelling of 721674474376440 in words is "seven hundred twenty-one trillion, six hundred seventy-four billion, four hundred seventy-four million, three hundred seventy-six thousand, four hundred forty".