721312384 has 128 divisors (see below), whose sum is σ = 1653281280. Its totient is φ = 310886400.

The previous prime is 721312379. The next prime is 721312393. The reversal of 721312384 is 483213127.

721312384 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

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, 1798584 + ... + 1798984.

It is an arithmetic number, because the mean of its divisors is an integer number (12916260).

Almost surely, 2^721312384 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 721312384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (826640640).

721312384 is an abundant number, since it is smaller than the sum of its proper divisors (931968896).

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

721312384 is a wasteful number, since it uses less digits than its factorization.

721312384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 486 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 721312384 is about 26857.2594283184. The cubic root of 721312384 is about 896.8251858018.

The spelling of 721312384 in words is "seven hundred twenty-one million, three hundred twelve thousand, three hundred eighty-four".