716721 has 8 divisors (see below), whose sum is σ = 979104. Its totient is φ = 466080.

The previous prime is 716713. The next prime is 716731. The reversal of 716721 is 127617.

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

It is not a de Polignac number, because 716721 - 2³ = 716713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 716691 and 716700.

It is not an unprimeable number, because it can be changed into a prime (716731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2791 + ... + 3036.

It is an arithmetic number, because the mean of its divisors is an integer number (122388).

2⁷¹⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

716721 is a deficient number, since it is larger than the sum of its proper divisors (262383).

716721 is a wasteful number, since it uses less digits than its factorization.

716721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5871.

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

The square root of 716721 is about 846.5937632655. The cubic root of 716721 is about 89.4918274322.

The spelling of 716721 in words is "seven hundred sixteen thousand, seven hundred twenty-one".