721317120 has 72 divisors (see below), whose sum is σ = 2303718816. Its totient is φ = 192350208.

The previous prime is 721317073. The next prime is 721317127. The reversal of 721317120 is 21713127.

721317120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721317127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90082 + ... + 97761.

Almost surely, 2^721317120 is an apocalyptic number.

It is an amenable number.

721317120 is an abundant number, since it is smaller than the sum of its proper divisors (1582401696).

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

721317120 is a wasteful number, since it uses less digits than its factorization.

721317120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187867 (or 187853 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 721317120 is about 26857.3475980038. The cubic root of 721317120 is about 896.8271485921.

The spelling of 721317120 in words is "seven hundred twenty-one million, three hundred seventeen thousand, one hundred twenty".