721797120 has 360 divisors, whose sum is σ = 2760292080. Its totient is φ = 173015040.

The previous prime is 721797119. The next prime is 721797127. The reversal of 721797120 is 21797127.

721797120 is digitally balanced in base 6, 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 (360).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721797127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8110036 + ... + 8110124.

It is an arithmetic number, because the mean of its divisors is an integer number (7667478).

Almost surely, 2^721797120 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 721797120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1380146040).

721797120 is an abundant number, since it is smaller than the sum of its proper divisors (2038494960).

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

721797120 is a wasteful number, since it uses less digits than its factorization.

721797120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 36.

The square root of 721797120 is about 26866.2822139573. The cubic root of 721797120 is about 897.0260354930.

The spelling of 721797120 in words is "seven hundred twenty-one million, seven hundred ninety-seven thousand, one hundred twenty".