724375721 has 8 divisors (see below), whose sum is σ = 744955200. Its totient is φ = 703966032.

The previous prime is 724375711. The next prime is 724375723. The reversal of 724375721 is 127573427.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 724375721 - 2⁶ = 724375657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (724375723) 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, 33770 + ... + 50883.

It is an arithmetic number, because the mean of its divisors is an integer number (93119400).

Almost surely, 2^724375721 is an apocalyptic number.

It is an amenable number.

724375721 is a deficient number, since it is larger than the sum of its proper divisors (20579479).

724375721 is a wasteful number, since it uses less digits than its factorization.

724375721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84895.

The product of its digits is 82320, while the sum is 38.

The square root of 724375721 is about 26914.2289690788. The cubic root of 724375721 is about 898.0929665178.

The spelling of 724375721 in words is "seven hundred twenty-four million, three hundred seventy-five thousand, seven hundred twenty-one".