721992764576 has 96 divisors (see below), whose sum is σ = 1463766973200. Its totient is φ = 350407622656.

The previous prime is 721992764533. The next prime is 721992764609. The reversal of 721992764576 is 675467299127.

It can be written as a sum of positive squares in 8 ways, for example, as 362736380176 + 359256384400 = 602276^2 + 599380^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64939370 + ... + 64950486.

Almost surely, 2^721992764576 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 721992764576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (731883486600).

721992764576 is an abundant number, since it is smaller than the sum of its proper divisors (741774208624).

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

721992764576 is a wasteful number, since it uses less digits than its factorization.

721992764576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11586 (or 11578 counting only the distinct ones).

The product of its digits is 80015040, while the sum is 65.

The spelling of 721992764576 in words is "seven hundred twenty-one billion, nine hundred ninety-two million, seven hundred sixty-four thousand, five hundred seventy-six".