721809096 has 64 divisors (see below), whose sum is σ = 1857619200. Its totient is φ = 233663040.

The previous prime is 721809089. The next prime is 721809119. The reversal of 721809096 is 690908127.

721809096 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 15 ways as a sum of consecutive naturals, for example, 9136785 + ... + 9136863.

It is an arithmetic number, because the mean of its divisors is an integer number (29025300).

Almost surely, 2^721809096 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 721809096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (928809600).

721809096 is an abundant number, since it is smaller than the sum of its proper divisors (1135810104).

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

721809096 is an frugal number, since it uses more digits than its factorization.

721809096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 721809096 is about 26866.5050946341. The cubic root of 721809096 is about 897.0309965936.

The spelling of 721809096 in words is "seven hundred twenty-one million, eight hundred nine thousand, ninety-six".