721216704 has 224 divisors, whose sum is σ = 2273564160. Its totient is φ = 199507968.

The previous prime is 721216697. The next prime is 721216711. The reversal of 721216704 is 407612127.

721216704 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (721216697) and next prime (721216711).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 975567 + ... + 976305.

It is an arithmetic number, because the mean of its divisors is an integer number (10149840).

Almost surely, 2^721216704 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 721216704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1136782080).

721216704 is an abundant number, since it is smaller than the sum of its proper divisors (1552347456).

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

721216704 is a wasteful number, since it uses less digits than its factorization.

721216704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807 (or 797 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 721216704 is about 26855.4781003802. The cubic root of 721216704 is about 896.7855302933.

The spelling of 721216704 in words is "seven hundred twenty-one million, two hundred sixteen thousand, seven hundred four".