721596 has 12 divisors (see below), whose sum is σ = 1683752. Its totient is φ = 240528.

The previous prime is 721577. The next prime is 721597. The reversal of 721596 is 695127.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721596.

It is not an unprimeable number, because it can be changed into a prime (721597) by changing a digit.

721596 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30055 + ... + 30078.

2⁷²¹⁵⁹⁶ is an apocalyptic number.

It is an amenable number.

721596 is an abundant number, since it is smaller than the sum of its proper divisors (962156).

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

721596 is a wasteful number, since it uses less digits than its factorization.

721596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60140 (or 60138 counting only the distinct ones).

The product of its digits is 3780, while the sum is 30.

The square root of 721596 is about 849.4680688525. The cubic root of 721596 is about 89.6942712617.

The spelling of 721596 in words is "seven hundred twenty-one thousand, five hundred ninety-six".