717320 has 32 divisors (see below), whose sum is σ = 1641600. Its totient is φ = 282048.

The previous prime is 717317. The next prime is 717323. The reversal of 717320 is 23717.

It is an interprime number because it is at equal distance from previous prime (717317) and next prime (717323).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 717292 and 717301.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 717320.

It is not an unprimeable number, because it can be changed into a prime (717323) 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, 3047 + ... + 3273.

It is an arithmetic number, because the mean of its divisors is an integer number (51300).

2⁷¹⁷³²⁰ 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 717320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (820800).

717320 is an abundant number, since it is smaller than the sum of its proper divisors (924280).

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

717320 is a wasteful number, since it uses less digits than its factorization.

717320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 294, while the sum is 20.

The square root of 717320 is about 846.9474599997. The cubic root of 717320 is about 89.5167514394.

The spelling of 717320 in words is "seven hundred seventeen thousand, three hundred twenty", and thus it is an iban number.