721330873344 has 231 divisors, whose sum is σ = 2164148559283. Its totient is φ = 240199022592.

The previous prime is 721330873337. The next prime is 721330873357. The reversal of 721330873344 is 443378033127.

The square root of 721330873344 is 849312.

It is a perfect power (a square), and thus also a powerful number.

721330873344 is a `hidden beast` number, since 7 + 2 + 1 + 3 + 308 + 7 + 334 + 4 = 666.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 721330873344.

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 733805077 + ... + 733806059.

Almost surely, 2^721330873344 is an apocalyptic number.

721330873344 is the 849312-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721330873344

721330873344 is an abundant number, since it is smaller than the sum of its proper divisors (1442817685939).

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

721330873344 is an frugal number, since it uses more digits than its factorization.

721330873344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004 (or 988 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 45.

The spelling of 721330873344 in words is "seven hundred twenty-one billion, three hundred thirty million, eight hundred seventy-three thousand, three hundred forty-four".