721611360 has 144 divisors (see below), whose sum is σ = 2471466816. Its totient is φ = 191729664.

The previous prime is 721611347. The next prime is 721611389. The reversal of 721611360 is 63116127.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 484537 + ... + 486023.

It is an arithmetic number, because the mean of its divisors is an integer number (17162964).

Almost surely, 2^721611360 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 721611360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1235733408).

721611360 is an abundant number, since it is smaller than the sum of its proper divisors (1749855456).

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

721611360 is a wasteful number, since it uses less digits than its factorization.

721611360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845 (or 1834 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 721611360 is about 26862.8248700690. The cubic root of 721611360 is about 896.9490767242.

Adding to 721611360 its reverse (63116127), we get a palindrome (784727487).

The spelling of 721611360 in words is "seven hundred twenty-one million, six hundred eleven thousand, three hundred sixty".